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== gpt-5-2-thinking == === User: ffmpeg cut from video the timestamsp 01:02 - 02:13 + 03:17 - 05:26 + 09:21 - 09:28 + 09:44 - 10:04 into a single video === ffmpeg cut from video the timestamsp 01:02 - 02:13 + 03:17 - 05:26 + 09:21 - 09:28 + 09:44 - 10:04 into a single video === Assistant: Here are two good ways to do it. === Here are two good ways to do it. ==== This will cut exactly at those timestamps and stitch into one file. ==== <syntaxhighlight lang="bash">ffmpeg -i input.mp4 -filter_complex \ "[0:v]trim=start=62:end=133,setpts=PTS-STARTPTS[v0]; \ [0:a]atrim=start=62:end=133,asetpts=PTS-STARTPTS[a0]; \ [0:v]trim=start=197:end=326,setpts=PTS-STARTPTS[v1]; \ [0:a]atrim=start=197:end=326,asetpts=PTS-STARTPTS[a1]; \ [0:v]trim=start=561:end=568,setpts=PTS-STARTPTS[v2]; \ [0:a]atrim=start=561:end=568,asetpts=PTS-STARTPTS[a2]; \ [0:v]trim=start=584:end=604,setpts=PTS-STARTPTS[v3]; \ [0:a]atrim=start=584:end=604,asetpts=PTS-STARTPTS[a3]; \ [v0][a0][v1][a1][v2][a2][v3][a3]concat=n=4:v=1:a=1[v][a]" \ -map "[v]" -map "[a]" \ -c:v libx264 -crf 20 -preset medium \ -c:a aac -b:a 160k \ -movflags +faststart \ output.mp4 </syntaxhighlight> Timestamps converted to seconds: * 01:02–02:13 → 62–133 * 03:17–05:26 → 197–326 * 09:21–09:28 → 561–568 * 09:44–10:04 → 584–604 : ==== This tries to avoid re-encoding. Often works, but accuracy depends on keyframes. ==== <syntaxhighlight lang="bash">ffmpeg -ss 01:02 -to 02:13 -i input.mp4 -c copy -avoid_negative_ts 1 part1.mp4 ffmpeg -ss 03:17 -to 05:26 -i input.mp4 -c copy -avoid_negative_ts 1 part2.mp4 ffmpeg -ss 09:21 -to 09:28 -i input.mp4 -c copy -avoid_negative_ts 1 part3.mp4 ffmpeg -ss 09:44 -to 10:04 -i input.mp4 -c copy -avoid_negative_ts 1 part4.mp4 printf "file 'part1.mp4'\nfile 'part2.mp4'\nfile 'part3.mp4'\nfile 'part4.mp4'\n" > list.txt ffmpeg -f concat -safe 0 -i list.txt -c copy output.mp4 </syntaxhighlight> If you tell me whether you want exact cuts (Option A) or fast/no re-encode (Option B), I can tailor the command for your codec/container constraints. === User: actually i want them separate in order to check them === actually i want them separate in order to check them also, i want to be able to cut up to miliseconds, if needed === Assistant: Got it — make separate clips, and allow millisecond precision. === Got it — make separate clips, and allow millisecond precision. ==== Use -ss/-to with input seeking (accurate) and re-encode. Put -ss after -i. ==== ===== <syntaxhighlight lang="bash">ffmpeg -i input.mp4 -ss 00:01:02.000 -to 00:02:13.000 \ ===== -c:v libx264 -crf 20 -preset medium -c:a aac -b:a 160k \ -movflags +faststart clip_01_0102-0213.mp4 </syntaxhighlight> ===== <syntaxhighlight lang="bash">ffmpeg -i input.mp4 -ss 00:03:17.000 -to 00:05:26.000 \ ===== -c:v libx264 -crf 20 -preset medium -c:a aac -b:a 160k \ -movflags +faststart clip_02_0317-0526.mp4 </syntaxhighlight> ===== <syntaxhighlight lang="bash">ffmpeg -i input.mp4 -ss 00:09:21.000 -to 00:09:28.000 \ ===== -c:v libx264 -crf 20 -preset medium -c:a aac -b:a 160k \ -movflags +faststart clip_03_0921-0928.mp4 </syntaxhighlight> ===== <syntaxhighlight lang="bash">ffmpeg -i input.mp4 -ss 00:09:44.000 -to 00:10:04.000 \ ===== -c:v libx264 -crf 20 -preset medium -c:a aac -b:a 160k \ -movflags +faststart clip_04_0944-1004.mp4 </syntaxhighlight> Millisecond edits: just change .000 to whatever you need, e.g. 00:03:17.237. ==== If you must keep original video quality, the only way to be frame/ms-accurate without re-encoding is basically impossible — stream copy can only cut cleanly on keyframes and audio packet boundaries. ==== However, you can do “almost-original” by re-encoding only around cut points, but that’s more complex and usually not worth it unless quality is critical. ==== With -ss after -i (like above), -to is treated as an end timestamp in the input timeline (works well for human timestamps). ==== If you ever prefer “duration”, use -t instead: <syntaxhighlight lang="bash"># from 01:02 for 71 seconds ffmpeg -i input.mp4 -ss 00:01:02.000 -t 00:01:11.000 ... </syntaxhighlight> ==== <syntaxhighlight lang="bash">in="input.mp4" ==== ffmpeg -i "$in" -ss 00:01:02.000 -to 00:02:13.000 -c:v libx264 -crf 20 -preset medium -c:a aac -b:a 160k -movflags +faststart clip_01.mp4 ffmpeg -i "$in" -ss 00:03:17.000 -to 00:05:26.000 -c:v libx264 -crf 20 -preset medium -c:a aac -b:a 160k -movflags +faststart clip_02.mp4 ffmpeg -i "$in" -ss 00:09:21.000 -to 00:09:28.000 -c:v libx264 -crf 20 -preset medium -c:a aac -b:a 160k -movflags +faststart clip_03.mp4 ffmpeg -i "$in" -ss 00:09:44.000 -to 00:10:04.000 -c:v libx264 -crf 20 -preset medium -c:a aac -b:a 160k -movflags +faststart clip_04.mp4 </syntaxhighlight> If you tell me your input codecs (paste ffprobe -hide_banner -i input.mp4), I can adjust settings to either keep the same FPS/resolution, preserve 5.1 audio, or speed it up with hardware encoding (NVENC/QSV/VAAPI). === User: why are "-c:v libx264 -crf 20 -preset medium -c:a aac -b:a 160k -movflags +faststart" needed? === why are "-c:v libx264 -crf 20 -preset medium -c:a aac -b:a 160k -movflags +faststart" needed? === Assistant: They’re not required to cut — they’re just the “safe defaults” that make the output widely playable and keep the cut ac… === They’re not required to cut — they’re just the “safe defaults” that make the output widely playable and keep the cut accurate. Here’s what each one does, and what happens if you remove it: ===== Chooses the video encoder (H.264). ===== * If you don’t specify -c:v, ffmpeg will pick a default encoder for the output container (often still H.264, but not guaranteed). * You could also use -c:v copy to avoid re-encoding, but then your cut won’t be millisecond-accurate (it’ll snap to keyframes / packet boundaries). ===== Quality target for x264 (“constant quality” mode). Lower = higher quality/bigger file; higher = lower quality/smaller file. ===== * Not required; if omitted, x264 uses its default CRF (commonly 23), which is a bit lower quality. * Typical range: 18–23. ===== Encoding speed vs compression efficiency. ===== * Not required; x264 defaults to medium anyway. * Slower presets = smaller file for same quality (but take longer). ===== Re-encodes audio to AAC at 160 kbps. ===== * Not required; ffmpeg might pick AAC anyway, but again not guaranteed. * If your source audio is already AAC and you don’t need frame-accurate audio boundaries, you might do -c:a copy. But for “exact cuts”, re-encoding audio avoids weird edge cases (missing samples, bad timestamps, concat issues later). ===== Moves the MP4 “moov atom” to the beginning so the file can start playing before fully downloaded (web-friendly). ===== * Not required for local playback. * It doesn’t change quality, only file layout. ==== You said: separate clips + millisecond precision if needed. ==== To cut with ms precision reliably, you generally need to decode and re-encode (at least video), because -c copy can only cut cleanly on keyframes and packet boundaries. So the shortest “ms-accurate” version is basically: <syntaxhighlight lang="bash">ffmpeg -i input.mp4 -ss 00:01:02.000 -to 00:02:13.000 -c:v libx264 -c:a aac clip_01.mp4 </syntaxhighlight> Everything else (-crf, -preset, -b:a, +faststart) is tuning / compatibility / convenience. ==== This is still ms-accurate for video (because it re-encodes video), and keeps audio untouched: ==== <syntaxhighlight lang="bash">ffmpeg -i input.mp4 -ss 00:01:02.000 -to 00:02:13.000 -c:v libx264 -crf 20 -preset medium -c:a copy clip_01.mp4 </syntaxhighlight> Caveat: if you later concatenate clips, audio-copy can sometimes make concat pickier depending on timestamps/codec parameters. ==== <syntaxhighlight lang="bash">ffmpeg -ss 00:01:02.000 -to 00:02:13.000 -i input.mp4 -c copy clip_01.mp4 ==== </syntaxhighlight> Fast, no quality loss — but cuts may be off by up to a few seconds if keyframes are sparse. If you tell me whether your priority is (1) perfect accuracy or (2) no re-encode / perfect quality, I’ll give you the best exact command for that. === User: i want to both preserve quality and be exact === i want to both preserve quality and be exact === Assistant: You can’t have both in the strict, literal sense unless your cut points land exactly on keyframes and audio packet boun… === You can’t have both in the strict, literal sense unless your cut points land exactly on keyframes (and audio packet boundaries). Reason: with -c copy ffmpeg is not allowed to invent new frames, so it can only start a clip on an existing keyframe; “millisecond exact” usually requires decoding frames and re-encoding the first GOP. So you have two practical ways to get what you mean by “preserve quality”: ==== This is the only “no quality change” method: ==== <syntaxhighlight lang="bash">ffmpeg -ss 00:01:02.000 -to 00:02:13.000 -i input.mp4 -c copy clip_01.mp4 </syntaxhighlight> But it will only be exact to the ms if there’s a keyframe exactly at 00:01:02.000 (rare). ==== You will re-encode, but you can make it lossless (or visually lossless). ==== ===== Per clip: ===== <syntaxhighlight lang="bash">ffmpeg -i input.mp4 -ss 00:01:02.000 -to 00:02:13.000 \ -c:v libx264 -qp 0 -preset veryslow \ -c:a copy \ clip_01_lossless.mkv </syntaxhighlight> Notes: * -qp 0 = lossless for x264. * I used MKV because it’s more forgiving; MP4 can be pickier with some codec combos. * -c:a copy keeps audio unchanged. ===== <syntaxhighlight lang="bash">ffmpeg -i input.mp4 -ss 00:01:02.000 -to 00:02:13.000 \ ===== -c:v libx264 -crf 16 -preset slow \ -c:a copy \ clip_01.mkv </syntaxhighlight> (You can use CRF 14–18 depending on how paranoid you are.) ==== If you want the final clips to be -c copy and exact, you can first create a version that has keyframes exactly at your cut points: ==== ===== <syntaxhighlight lang="bash">ffmpeg -i input.mp4 \ ===== -c:v libx264 -qp 0 -preset veryslow \ -force_key_frames "00:01:02.000,00:02:13.000,00:03:17.000,00:05:26.000,00:09:21.000,00:09:28.000,00:09:44.000,00:10:04.000" \ -c:a copy \ keyed.mkv </syntaxhighlight> ===== <syntaxhighlight lang="bash">ffmpeg -ss 00:01:02.000 -to 00:02:13.000 -i keyed.mkv -c copy clip_01.mkv ===== ffmpeg -ss 00:03:17.000 -to 00:05:26.000 -i keyed.mkv -c copy clip_02.mkv ffmpeg -ss 00:09:21.000 -to 00:09:28.000 -i keyed.mkv -c copy clip_03.mkv ffmpeg -ss 00:09:44.000 -to 00:10:04.000 -i keyed.mkv -c copy clip_04.mkv </syntaxhighlight> This still “changes” the video once (step 1), but with -qp 0 it’s lossless, so quality is preserved. If you tell me your source codec/pix_fmt (paste ffprobe -hide_banner -i input.mp4), I can adjust for 10-bit / HDR, H.265, or ensure audio stays compatible with MP4 if you really need MP4 outputs. === User: here is the original video. === here is the original video. change your answer to fit its format/properties (in case any change does any improvement) === Assistant: Your source is: === Your source is: * Container: MKV * Video: H.264 High, 1920×1080, 30 fps, yuv420p, BT.709 / TV range * Audio: Opus, 48 kHz, stereo So the “best fit” output (same kind of file) is: MKV + H.264 + Opus, keeping 1080p/30fps/pix_fmt and BT.709 metadata. Because you want exact cuts and “preserve quality”, the most faithful option is lossless H.264 re-encode (x264 -qp 0). That guarantees exact timestamps (ms) and no generation loss (but files can be bigger). ==== ### ==== <syntaxhighlight lang="bash">ffmpeg -i "NEA MADALIN E DRAG QUEEN ACUM [P9gZEDOz9eE].mkv" -filter_complex \ "[0:v]trim=start=62:end=133,setpts=PTS-STARTPTS[v];[0:a]atrim=start=62:end=133,asetpts=PTS-STARTPTS[a]" \ -map "[v]" -map "[a]" \ -c:v libx264 -preset veryslow -qp 0 -pix_fmt yuv420p -profile:v high -level 4.0 \ -color_range tv -colorspace bt709 -color_trc bt709 -color_primaries bt709 \ -c:a libopus -b:a 160k -ar 48000 -ac 2 \ clip_01_0102-0213.mkv </syntaxhighlight> ===== <syntaxhighlight lang="bash">ffmpeg -i "NEA MADALIN E DRAG QUEEN ACUM [P9gZEDOz9eE].mkv" -filter_complex \ ===== "[0:v]trim=start=197:end=326,setpts=PTS-STARTPTS[v];[0:a]atrim=start=197:end=326,asetpts=PTS-STARTPTS[a]" \ -map "[v]" -map "[a]" \ -c:v libx264 -preset veryslow -qp 0 -pix_fmt yuv420p -profile:v high -level 4.0 \ -color_range tv -colorspace bt709 -color_trc bt709 -color_primaries bt709 \ -c:a libopus -b:a 160k -ar 48000 -ac 2 \ clip_02_0317-0526.mkv </syntaxhighlight> ===== <syntaxhighlight lang="bash">ffmpeg -i "NEA MADALIN E DRAG QUEEN ACUM [P9gZEDOz9eE].mkv" -filter_complex \ ===== "[0:v]trim=start=561:end=568,setpts=PTS-STARTPTS[v];[0:a]atrim=start=561:end=568,asetpts=PTS-STARTPTS[a]" \ -map "[v]" -map "[a]" \ -c:v libx264 -preset veryslow -qp 0 -pix_fmt yuv420p -profile:v high -level 4.0 \ -color_range tv -colorspace bt709 -color_trc bt709 -color_primaries bt709 \ -c:a libopus -b:a 160k -ar 48000 -ac 2 \ clip_03_0921-0928.mkv </syntaxhighlight> ===== <syntaxhighlight lang="bash">ffmpeg -i "NEA MADALIN E DRAG QUEEN ACUM [P9gZEDOz9eE].mkv" -filter_complex \ ===== "[0:v]trim=start=584:end=604,setpts=PTS-STARTPTS[v];[0:a]atrim=start=584:end=604,asetpts=PTS-STARTPTS[a]" \ -map "[v]" -map "[a]" \ -c:v libx264 -preset veryslow -qp 0 -pix_fmt yuv420p -profile:v high -level 4.0 \ -color_range tv -colorspace bt709 -color_trc bt709 -color_primaries bt709 \ -c:a libopus -b:a 160k -ar 48000 -ac 2 \ clip_04_0944-1004.mkv </syntaxhighlight> ===== Just use decimals in the start= / end= values, e.g.: ===== * trim=start=197.237:end=326.041 * atrim=start=197.237:end=326.041 ==== Same commands, just replace -qp 0 -preset veryslow with: ==== * Very high quality: -crf 16 -preset slow * Still excellent: -crf 18 -preset slow Example swap: <syntaxhighlight lang="bash">-c:v libx264 -crf 16 -preset slow </syntaxhighlight> ===== With MKV + Opus (and your file starting at -0.007s), trim/atrim + setpts/asetpts reliably: ===== * cuts exactly (including ms), * resets each clip to start at t=0 cleanly, * avoids weird negative start timestamps. If you want, tell me one clip where you need ms precision (start/end), and I’ll plug those exact values into the command for you. === User: note that i still might need to cut up to miliseconds === note that i still might need to cut up to miliseconds === Assistant: Yep — the approach I gave still works fine with milliseconds. === Yep — the approach I gave still works fine with milliseconds. You just put decimals on the cut points. ===== You can do it either as seconds with decimals: ===== * start=62.137:end=133.904 or as HH:MM:SS.mmm (ffmpeg accepts this format too, but inside trim it’s simplest to use seconds). ===== Say you decide clip 2 should be 03:17.237 → 05:26.041. ===== 03:17.237 = 197.237 seconds 05:26.041 = 326.041 seconds <syntaxhighlight lang="bash">ffmpeg -i "NEA MADALIN E DRAG QUEEN ACUM [P9gZEDOz9eE].mkv" -filter_complex \ "[0:v]trim=start=197.237:end=326.041,setpts=PTS-STARTPTS[v]; \ [0:a]atrim=start=197.237:end=326.041,asetpts=PTS-STARTPTS[a]" \ -map "[v]" -map "[a]" \ -c:v libx264 -preset veryslow -qp 0 -pix_fmt yuv420p -profile:v high -level 4.0 \ -color_range tv -colorspace bt709 -color_trc bt709 -color_primaries bt709 \ -c:a libopus -b:a 160k -ar 48000 -ac 2 \ clip_02_0317p237-0526p041.mkv </syntaxhighlight> ===== Your video is 30 fps, so frames are spaced about 33.333 ms apart. ===== That means: * You can type millisecond timestamps, * but the actual video cut can only land on a frame boundary (≈33ms steps). * Audio can be trimmed much more finely (sample-level). If you want, paste the exact ms cut points you end up with (like 01:02.153–02:13.087) and I’ll rewrite all 4 commands with those exact values. === User: first one is 01:02.2 till 02:13.2 === first one is 01:02.2 till 02:13.2 === Assistant: Cool — for clip 1 you want 00:01:02.200 → 00:02:13.200 i.e. === Cool — for clip 1 you want 00:01:02.200 → 00:02:13.200 (i.e. 62.2s → 133.2s). ===== <syntaxhighlight lang="bash">ffmpeg -i "NEA MADALIN E DRAG QUEEN ACUM [P9gZEDOz9eE].mkv" -filter_complex \ ===== "[0:v]trim=start=62.2:end=133.2,setpts=PTS-STARTPTS[v]; \ [0:a]atrim=start=62.2:end=133.2,asetpts=PTS-STARTPTS[a]" \ -map "[v]" -map "[a]" \ -c:v libx264 -preset veryslow -qp 0 -pix_fmt yuv420p -profile:v high -level 4.0 \ -color_range tv -colorspace bt709 -color_trc bt709 -color_primaries bt709 \ -c:a libopus -b:a 160k -ar 48000 -ac 2 \ clip_01_0102p2-0213p2.mkv </syntaxhighlight> Quick note: your video is 30 fps, so the video cut will land on the nearest frame boundary (~33.3 ms steps). Audio can still be trimmed more finely. === User: $ ffmpeg -i "NEA MADALIN E DRAG QUEEN ACUM P9gZEDOz9eE.mkv" -filtercomplex \ === $ ffmpeg -i "NEA MADALIN E DRAG QUEEN ACUM [P9gZEDOz9eE].mkv" -filter_complex \ "[0:v]trim=start=62.2:end=133.2,setpts=PTS-STARTPTS[v]; \ [0:a]atrim=start=62.2:end=133.2,asetpts=PTS-STARTPTS[a]" \ -map "[v]" -map "[a]" \ -c:v libx264 -preset veryslow -qp 0 -pix_fmt yuv420p -profile:v high -level 4.0 \ -color_range tv -colorspace bt709 -color_trc bt709 -color_primaries bt709 \ -c:a libopus -b:a 160k -ar 48000 -ac 2 \ clip_01_0102p2-0213p2.mkv ffmpeg version 4.4.2-0ubuntu0.22.04.1 Copyright (c) 2000-2021 the FFmpeg developers built with gcc 11 (Ubuntu 11.2.0-19ubuntu1) configuration: --prefix=/usr --extra-version=0ubuntu0.22.04.1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libdav1d --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librabbitmq --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzimg --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opencl --enable-opengl --enable-sdl2 --enable-pocketsphinx --enable-librsvg --enable-libmfx --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared WARNING: library configuration mismatch avcodec configuration: --prefix=/usr --extra-version=0ubuntu0.22.04.1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libdav1d --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librabbitmq --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzimg --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opencl --enable-opengl --enable-sdl2 --enable-pocketsphinx --enable-librsvg --enable-libmfx --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared --enable-version3 --disable-doc --disable-programs --enable-libaribb24 --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libtesseract --enable-libvo_amrwbenc --enable-libsmbclient libavutil 56. 70.100 / 56. 70.100 libavcodec 58.134.100 / 58.134.100 libavformat 58. 76.100 / 58. 76.100 libavdevice 58. 13.100 / 58. 13.100 libavfilter 7.110.100 / 7.110.100 libswscale 5. 9.100 / 5. 9.100 libswresample 3. 9.100 / 3. 9.100 libpostproc 55. 9.100 / 55. 9.100 Input #0, matroska,webm, from 'NEA MADALIN E DRAG QUEEN ACUM [P9gZEDOz9eE].mkv': Metadata: COMPATIBLE_BRANDS: iso6avc1mp41 MAJOR_BRAND : dash MINOR_VERSION : 0 ENCODER : Lavf58.76.100 Duration: 00:25:49.28, start: -0.007000, bitrate: 2264 kb/s Stream #0:0: Video: h264 (High), yuv420p(tv, bt709, progressive), 1920x1080 [SAR 1:1 DAR 16:9], 30 fps, 30 tbr, 1k tbn, 60 tbc (default) Metadata: HANDLER_NAME : ISO Media file produced by Google Inc. VENDOR_ID : [0][0][0][0] DURATION : 00:25:49.266000000 Stream #0:1(eng): Audio: opus, 48000 Hz, stereo, fltp (default) Metadata: DURATION : 00:25:49.281000000 Stream mapping: Stream #0:0 (h264) -> trim Stream #0:1 (opus) -> atrim setpts -> Stream #0:0 (libx264) asetpts -> Stream #0:1 (libopus) Press [q] to stop, [?] for help x264 [error]: high profile doesn't support lossless [libx264 @ 0x5874e72a1640] Error setting profile high. [libx264 @ 0x5874e72a1640] Possible profiles: baseline main high high10 high422 high444 Error initializing output stream 0:0 -- Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height [libopus @ 0x5874e739cb80] 1 frames left in the queue on closing Conversion failed! === Assistant: That error is because of this combo: === That error is because of this combo: * -qp 0 = lossless * -profile:v high = forces “High” profile x264 refuses that: “high profile doesn't support lossless”. For lossless, x264 switches to a different profile (typically High 4:4:4 Predictive) automatically. When you force high, it can’t. ===== Use this: ===== <syntaxhighlight lang="bash">ffmpeg -i "NEA MADALIN E DRAG QUEEN ACUM [P9gZEDOz9eE].mkv" -filter_complex \ "[0:v]trim=start=62.2:end=133.2,setpts=PTS-STARTPTS[v]; \ [0:a]atrim=start=62.2:end=133.2,asetpts=PTS-STARTPTS[a]" \ -map "[v]" -map "[a]" \ -c:v libx264 -preset veryslow -qp 0 -pix_fmt yuv420p \ -c:a libopus -b:a 160k -ar 48000 -ac 2 \ clip_01_0102p2-0213p2.mkv </syntaxhighlight> That will cut exactly (including milliseconds) and keep video lossless. ===== Even though your pixel format stays yuv420p, a lossless x264 encode often signals a profile like High 4:4:4 Predictive. Some hardware players (TVs/phones) may not like that, even if VLC/mpv do. ===== If you want maximum compatibility while still being visually indistinguishable from the source, do this instead: <syntaxhighlight lang="bash">ffmpeg -i "NEA MADALIN E DRAG QUEEN ACUM [P9gZEDOz9eE].mkv" -filter_complex \ "[0:v]trim=start=62.2:end=133.2,setpts=PTS-STARTPTS[v]; \ [0:a]atrim=start=62.2:end=133.2,asetpts=PTS-STARTPTS[a]" \ -map "[v]" -map "[a]" \ -c:v libx264 -crf 16 -preset slow -pix_fmt yuv420p -profile:v high -level 4.0 \ -c:a libopus -b:a 160k -ar 48000 -ac 2 \ clip_01_0102p2-0213p2.mkv </syntaxhighlight> ===== Just change 62.2 / 133.2 to e.g. 62.237 / 133.041. ===== If you send the ms-precise times for the other 3 clips, I’ll spit out all 4 final commands in the same style. === User: second is 03:17.10 to 05:26.20 === second is 03:17.10 to 05:26.20 === Assistant: Great — that’s: === Great — that’s: * start 00:03:17.100 = 197.1 seconds * end 00:05:26.200 = 326.2 seconds Here’s the matching command (same settings as the fixed lossless version — no forced -profile:v high): <syntaxhighlight lang="bash">ffmpeg -i "NEA MADALIN E DRAG QUEEN ACUM [P9gZEDOz9eE].mkv" -filter_complex \ "[0:v]trim=start=197.1:end=326.2,setpts=PTS-STARTPTS[v]; \ [0:a]atrim=start=197.1:end=326.2,asetpts=PTS-STARTPTS[a]" \ -map "[v]" -map "[a]" \ -c:v libx264 -preset veryslow -qp 0 -pix_fmt yuv420p \ -c:a libopus -b:a 160k -ar 48000 -ac 2 \ clip_02_0317p10-0526p20.mkv </syntaxhighlight> If you want the filename to reflect milliseconds more clearly, you can rename it after (or I can format it differently). Send clip 3 + 4 ms times when ready. === User: 09:21:00 till 09:28:30 === 09:21:00 till 09:28:30 === Assistant: That’s: === That’s: * start 00:09:21.000 = 561.0 seconds * end 00:09:28.300 = 568.3 seconds <syntaxhighlight lang="bash">ffmpeg -i "NEA MADALIN E DRAG QUEEN ACUM [P9gZEDOz9eE].mkv" -filter_complex \ "[0:v]trim=start=561.0:end=568.3,setpts=PTS-STARTPTS[v]; \ [0:a]atrim=start=561.0:end=568.3,asetpts=PTS-STARTPTS[a]" \ -map "[v]" -map "[a]" \ -c:v libx264 -preset veryslow -qp 0 -pix_fmt yuv420p \ -c:a libopus -b:a 160k -ar 48000 -ac 2 \ clip_03_0921p00-0928p30.mkv </syntaxhighlight> Send the last interval (09:44–10:04 with ms) and I’ll format that one too. === User: 09:44:10 to 10:04:20 === 09:44:10 to 10:04:20 === Assistant: That’s: === That’s: * start 00:09:44.100 = 584.1 seconds * end 00:10:04.200 = 604.2 seconds <syntaxhighlight lang="bash">ffmpeg -i "NEA MADALIN E DRAG QUEEN ACUM [P9gZEDOz9eE].mkv" -filter_complex \ "[0:v]trim=start=584.1:end=604.2,setpts=PTS-STARTPTS[v]; \ [0:a]atrim=start=584.1:end=604.2,asetpts=PTS-STARTPTS[a]" \ -map "[v]" -map "[a]" \ -c:v libx264 -preset veryslow -qp 0 -pix_fmt yuv420p \ -c:a libopus -b:a 160k -ar 48000 -ac 2 \ clip_04_0944p10-1004p20.mkv </syntaxhighlight> If you want, here are all four commands together (same settings) so you can paste once: <syntaxhighlight lang="bash">in="NEA MADALIN E DRAG QUEEN ACUM [P9gZEDOz9eE].mkv" ffmpeg -i "$in" -filter_complex "[0:v]trim=start=62.2:end=133.2,setpts=PTS-STARTPTS[v];[0:a]atrim=start=62.2:end=133.2,asetpts=PTS-STARTPTS[a]" -map "[v]" -map "[a]" -c:v libx264 -preset veryslow -qp 0 -pix_fmt yuv420p -c:a libopus -b:a 160k -ar 48000 -ac 2 clip_01_0102p20-0213p20.mkv ffmpeg -i "$in" -filter_complex "[0:v]trim=start=197.1:end=326.2,setpts=PTS-STARTPTS[v];[0:a]atrim=start=197.1:end=326.2,asetpts=PTS-STARTPTS[a]" -map "[v]" -map "[a]" -c:v libx264 -preset veryslow -qp 0 -pix_fmt yuv420p -c:a libopus -b:a 160k -ar 48000 -ac 2 clip_02_0317p10-0526p20.mkv ffmpeg -i "$in" -filter_complex "[0:v]trim=start=561.0:end=568.3,setpts=PTS-STARTPTS[v];[0:a]atrim=start=561.0:end=568.3,asetpts=PTS-STARTPTS[a]" -map "[v]" -map "[a]" -c:v libx264 -preset veryslow -qp 0 -pix_fmt yuv420p -c:a libopus -b:a 160k -ar 48000 -ac 2 clip_03_0921p00-0928p30.mkv ffmpeg -i "$in" -filter_complex "[0:v]trim=start=584.1:end=604.2,setpts=PTS-STARTPTS[v];[0:a]atrim=start=584.1:end=604.2,asetpts=PTS-STARTPTS[a]" -map "[v]" -map "[a]" -c:v libx264 -preset veryslow -qp 0 -pix_fmt yuv420p -c:a libopus -b:a 160k -ar 48000 -ac 2 clip_04_0944p10-1004p20.mkv </syntaxhighlight> === User: ok, now in a single ffmpeg command create the combined video of the cuts === ok, now in a single ffmpeg command create the combined video of the cuts === Assistant: Here’s a single ffmpeg command that cuts your 4 timestamp ranges with milliseconds and concats them into one output. === Here’s a single ffmpeg command that cuts your 4 timestamp ranges (with milliseconds) and concats them into one output. ===== Combined output (exact cuts, lossless video, MKV + H.264 + Opus) ===== <syntaxhighlight lang="bash">ffmpeg -i "NEA MADALIN E DRAG QUEEN ACUM [P9gZEDOz9eE].mkv" -filter_complex \ "[0:v]trim=start=62.2:end=133.2,setpts=PTS-STARTPTS[v0]; \ [0:a]atrim=start=62.2:end=133.2,asetpts=PTS-STARTPTS[a0]; \ [0:v]trim=start=197.1:end=326.2,setpts=PTS-STARTPTS[v1]; \ [0:a]atrim=start=197.1:end=326.2,asetpts=PTS-STARTPTS[a1]; \ [0:v]trim=start=561.0:end=568.3,setpts=PTS-STARTPTS[v2]; \ [0:a]atrim=start=561.0:end=568.3,asetpts=PTS-STARTPTS[a2]; \ [0:v]trim=start=584.1:end=604.2,setpts=PTS-STARTPTS[v3]; \ [0:a]atrim=start=584.1:end=604.2,asetpts=PTS-STARTPTS[a3]; \ [v0][a0][v1][a1][v2][a2][v3][a3]concat=n=4:v=1:a=1[v][a]" \ -map "[v]" -map "[a]" \ -c:v libx264 -preset veryslow -qp 0 -pix_fmt yuv420p \ -c:a libopus -b:a 160k -ar 48000 -ac 2 \ combined_cuts.mkv </syntaxhighlight> If you decide “lossless” is overkill and you want maximum playback compatibility (High profile) while still looking identical to most eyes, swap the video settings to: <syntaxhighlight lang="bash">-c:v libx264 -crf 16 -preset slow -pix_fmt yuv420p -profile:v high -level 4.0 </syntaxhighlight> (Everything else can stay the same.) === User: how much will be duration of the new video? === how much will be duration of the new video? === Assistant: Let’s add up each kept segment: === Let’s add up each kept segment: # 01:02.200 → 02:13.200 133.2 − 62.2 = 71.0 s # 03:17.100 → 05:26.200 326.2 − 197.1 = 129.1 s # 09:21.000 → 09:28.300 568.3 − 561.0 = 7.3 s # 09:44.100 → 10:04.200 604.2 − 584.1 = 20.1 s Total = 71.0 + 129.1 + 7.3 + 20.1 = 227.5 seconds = 3 minutes 47.5 seconds (i.e., 00:03:47.500) === User: do cummulative sum and also convert into minutes so i can see where the cuts are of the total === do cummulative sum (and also convert into minutes) so i can see where the cuts are of the total === Assistant: Sure — here are the segment lengths and the cumulative timeline in the new combined video. === Sure — here are the segment lengths and the cumulative timeline in the new combined video. ===== Segment durations ===== * S1 (01:02.200 → 02:13.200): 71.000 s = 1.1833 min = 01:11.000 * S2 (03:17.100 → 05:26.200): 129.100 s = 2.1517 min = 02:09.100 * S3 (09:21.000 → 09:28.300): 7.300 s = 0.1217 min = 00:07.300 * S4 (09:44.100 → 10:04.200): 20.100 s = 0.3350 min = 00:20.100 ===== Cumulative positions in the combined output ===== | Segment | In source | Duration | Starts at (new) | Ends at (new) | End (minutes) | | ------- | ------------------- | --------- | --------------- | ------------- | ------------- | | S1 | 01:02.200–02:13.200 | 71.000 s | 00:00.000 | 01:11.000 | 1.1833 min | | S2 | 03:17.100–05:26.200 | 129.100 s | 01:11.000 | 03:20.100 | 3.3350 min | | S3 | 09:21.000–09:28.300 | 7.300 s | 03:20.100 | 03:27.400 | 3.4567 min | | S4 | 09:44.100–10:04.200 | 20.100 s | 03:27.400 | 03:47.500 | 3.7917 min | Total combined duration: 227.500 s = 3.7917 min = 03:47.500 === User: make the table ascii only === make the table ascii only === Assistant: === <syntaxhighlight>+---------+-------------------------+-----------+----------------+----------------+-------------+ | Segment | In source | Duration | Starts at (new) | Ends at (new) | End (min) | +---------+-------------------------+-----------+----------------+----------------+-------------+ | S1 | 01:02.200 - 02:13.200 | 01:11.000 | 00:00.000 | 01:11.000 | 1.1833 min | | S2 | 03:17.100 - 05:26.200 | 02:09.100 | 01:11.000 | 03:20.100 | 3.3350 min | | S3 | 09:21.000 - 09:28.300 | 00:07.300 | 03:20.100 | 03:27.400 | 3.4567 min | | S4 | 09:44.100 - 10:04.200 | 00:20.100 | 03:27.400 | 03:47.500 | 3.7917 min | +---------+-------------------------+-----------+----------------+----------------+-------------+ | TOTAL | | 03:47.500 | | | 3.7917 min | +---------+-------------------------+-----------+----------------+----------------+-------------+ </syntaxhighlight>
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