Re: [FFmpeg-user] extract first 26 seconds not workings as expected
Hello Carl, > Please test current FFmpeg git head, if the issue is reproducible > provide an input sample. I tested with current git and the results were the same. As noticed by Moritz at the output of ffprobe $ ffprobe part1.mp4 ffprobe version N-98341-gcca982ee01 Copyright (c) 2007-2020 the FFmpeg developers built with gcc 8 (Debian 8.3.0-6) configuration: --toolchain=hardened --arch=amd64 --enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --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-librsvg --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared libavutil 56. 55.100 / 56. 55.100 libavcodec 58. 93.100 / 58. 93.100 libavformat 58. 47.100 / 58. 47.100 libavdevice 58. 11.100 / 58. 11.100 libavfilter 7. 86.100 / 7. 86.100 libavresample 4. 0. 0 / 4. 0. 0 libswscale 5. 8.100 / 5. 8.100 libswresample 3. 8.100 / 3. 8.100 libpostproc 55. 8.100 / 55. 8.100 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'part1.mp4': Metadata: major_brand : isom minor_version : 512 compatible_brands: isomiso2avc1mp41 encoder : Lavf58.47.100 Duration: 00:00:13.54, start: 12.666016, bitrate: 316 kb/s Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 1366x768 [SAR 1:1 DAR 683:384], 316 kb/s, 24 fps, 24 tbr, 12288 tbn, 48 tbc (default) Metadata: handler_name : VideoHandler the Duration and the start values are 13.54 and 12.66, respectively. It looks like that ffmpeg is not respecting "extract from 0 to 26" and instead doing something like "well, I will start at 12.6 and will stop at 26" Forcing with -copyinkf as suggested by Moritz, although the extracted part has, indeed, 26 seconds, there is only a "gray screen" from 0 to 12.6 and after that it plays well. The main.mp4 file plays normal. Kind regards, Leonardo ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe". ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
Re: [FFmpeg-user] extract first 26 seconds not workings as expected
Hello
>You may want to try the option "-copyinkf" ("copy initial
>non-keyframes") when using "-c copy".
I tried with this option, but the extracted part was "grayed" at the beginning.
The only workaround that I found that worked was
$ ffmpeg -i main.mp4 -vf "trim=start=0:end=26" part1.mp4
but re-encoded is needed.
As you pointed out, the file has 23.80 fps, and this may be the problem.
I created a sample video (53.63 seconds) if someone want to try some code on it.
The video of the original post and this one were created using
SimpleScreenRecorder
Perhaps some configuration on the GUI is not properly set to produce a "good
video file".
Will try to play with it a bit.
Kind regard,
Leonardo
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Re: [FFmpeg-user] extract first 26 seconds not workings as expected
On Sun, Jun 28, 2020 at 18:31:15 +, Leonardo via ffmpeg-user wrote:
> $ ffmpeg -i main.mp4 -ss 00:00:00.00 -t 00:00:26.00 -c copy part1.mp4
[...]
> frame= 322 fps=0.0 q=-1.0 Lsize= 523kB time=00:00:25.95 bitrate=
> 165.2kbits/s speed=8.19e+03x
> video:519kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB
> muxing overhead: 0.881877%
322 frames at 23.8 fps looks suspiciously like 13.5 seconds.
> However, file part1.mp4 has only 13 seconds!
> Duration: 00:00:13.42, start: 12.666016, bitrate: 319 kb/s
13.42 + 12.66 is approximately 25.
So my guess is that your input file's first keyframe is at 12.66
seconds, and ffmpeg refuses to copy the frames before that one.
You may want to try the option "-copyinkf" ("copy initial
non-keyframes") when using "-c copy".
> Also, how can I cut one part that begins at 00:01:00 and ends at 00:02:16 ?
How about "-ss 00:01:00 -t 1:16"? (I'm also not sure how this behaves
without keyframes, and whether that segment will ever be playable.)
Moritz
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Re: [FFmpeg-user] extract first 26 seconds not workings as expected
Am So., 28. Juni 2020 um 20:31 Uhr schrieb Leonardo via ffmpeg-user : > I have a video (main.mp4 - that has about 52 minutes) that I want to cut its > first 26 seconds. > > For this, I'm using command > > $ ffmpeg -i main.mp4 -ss 00:00:00.00 -t 00:00:26.00 -c copy part1.mp4 > ffmpeg version 4.2.3 Copyright (c) 2000-2020 the FFmpeg developers Please test current FFmpeg git head, if the issue is reproducible provide an input sample. Carl Eugen ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
[FFmpeg-user] extract first 26 seconds not workings as expected
Hello, I have a video (main.mp4 - that has about 52 minutes) that I want to cut its first 26 seconds. For this, I'm using command $ ffmpeg -i main.mp4 -ss 00:00:00.00 -t 00:00:26.00 -c copy part1.mp4 ffmpeg version 4.2.3 Copyright (c) 2000-2020 the FFmpeg developers built with gcc 8 (Debian 8.3.0-6) configuration: --toolchain=hardened --arch=amd64 --enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --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-librsvg --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared libavutil 56. 31.100 / 56. 31.100 libavcodec 58. 54.100 / 58. 54.100 libavformat 58. 29.100 / 58. 29.100 libavdevice 58. 8.100 / 58. 8.100 libavfilter 7. 57.100 / 7. 57.100 libavresample 4. 0. 0 / 4. 0. 0 libswscale 5. 5.100 / 5. 5.100 libswresample 3. 5.100 / 3. 5.100 libpostproc 55. 5.100 / 55. 5.100 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'main.mp4': Metadata: major_brand : isom minor_version : 512 compatible_brands: isomiso2avc1mp41 encoder : Lavf58.29.100 Duration: 00:52:08.25, start: 0.00, bitrate: 182 kb/s Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 1366x768 [SAR 1:1 DAR 683:384], 180 kb/s, 23.80 fps, 24 tbr, 12288 tbn, 48 tbc (default) Metadata: handler_name : VideoHandler Output #0, mp4, to 'part1.mp4': Metadata: major_brand : isom minor_version : 512 compatible_brands: isomiso2avc1mp41 encoder : Lavf58.29.100 Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 1366x768 [SAR 1:1 DAR 683:384], q=2-31, 180 kb/s, 23.80 fps, 24 tbr, 12288 tbn, 12288 tbc (default) Metadata: handler_name : VideoHandler Stream mapping: Stream #0:0 -> #0:0 (copy) Press [q] to stop, [?] for help frame= 322 fps=0.0 q=-1.0 Lsize= 523kB time=00:00:25.95 bitrate= 165.2kbits/s speed=8.19e+03x video:519kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.881877% However, file part1.mp4 has only 13 seconds! $ ffprobe part1.mp4 ffprobe version 4.2.3 Copyright (c) 2007-2020 the FFmpeg developers built with gcc 8 (Debian 8.3.0-6) configuration: --toolchain=hardened --arch=amd64 --enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --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-librsvg --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared libavutil 56. 31.100 / 56. 31.100 libavcodec 58. 54.100 / 58. 54.100 libavformat 58. 29.100 / 58. 29.100 libavdevice 58. 8.100 / 58. 8.100 libavfilter 7. 57.100 / 7. 57.100 libavresample 4. 0. 0 / 4. 0. 0 libswscale 5. 5.100 / 5. 5.100 libswresample 3. 5.100 / 3. 5.100 libpostproc 55. 5.100 / 55. 5.100 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'part1.mp4': Metadata: major_brand : isom minor_version : 512 compatible_brands: isomiso2avc1mp41 encoder : Lavf58.29.100 Duration: 00:00:13.42, start: 12.666016, bitrate: 319 kb/s Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 1366x768 [SAR 1:1 DAR 683:384], 316 kb/s, 24 fps, 24 tbr, 12288
