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• Trouble trimming video by frame number with ffmpeg

  8 décembre 2023, par jgore200377

  I want to trim/split a video with ffmpeg using frames. The reason why is because I am using a Shot Transition Detection model which returns a probability of transition for every frame in the video.

  


  Using timestamps to cut the video has yielded bad results as the precision is not 100%.

  


  Ive tried this command which just outputs the entire video which is DEFINITELY not what I want

  


  ffmpeg -i video.mp4 -vf "trim=start_frame=100:end_frame=200,setpts=PTS-STARTPTS" -c:a copy output.mp4


  


  Ive also tried using python bindings with ffmpeg-python

  


  import ffmpeg

input_file = ffmpeg.input('video.mp4')
output_file = ffmpeg.output(input_file.trim(start_frame=1300, end_frame=1500), 'test_output.mp4')
ffmpeg.run(output_file)


  


  This doesnt work either and outputs a video with half of it being still with unpredictable length

  


  ---

  


  Ive visited some other sites but none seem to have this nailed down and it would be much appreciated if someone can answer how to use frames to trim/split a video with ffmpeg.

  


• Ffmpeg dynamic cropping for every frame

  25 janvier 2024, par Aman Mehta

  I have different crop parameters for every frame. I was using sendcmd but apparently, that is not working.

  


  This is the format of my sendcmd file

  


  0.00 crop 'w=466:h=432:x=1373:y=336';
0.02 crop 'w=324:h=382:x=277:y=693';
0.03 crop 'w=304:h=332:x=1364:y=794';
0.05 crop 'w=348:h=448:x=1500:y=966';
0.07 crop 'w=466:h=412:x=794:y=193';
0.08 crop 'w=390:h=502:x=1425:y=813';


  


  And I am running this command

  


  ffmpeg -ss 0 -t 1 -i Demo.mp4 -filter_complex "[0:v]sendcmd=f=crop_parameters.txt[video]" -map "[video]" output_%03d.png


  


  These are the logs coming from FFmpeg

  


  [Parsed_sendcmd_0 @ 0x6000016709a0] [expr] interval #0 start_ts:0.000000 end_ts:9223372036854.775391 ts:0.083367
[Parsed_sendcmd_0 @ 0x6000016709a0] [expr] interval #1 start_ts:0.040000 end_ts:9223372036854.775391 ts:0.083367
[Parsed_sendcmd_0 @ 0x6000016709a0] [enter+expr] interval #2 start_ts:0.080000 end_ts:9223372036854.775391 ts:0.083367
[Parsed_sendcmd_0 @ 0x6000016709a0] Processing command #0 target:crop command:w arg:147
[Parsed_sendcmd_0 @ 0x6000016709a0] Command reply for command #0: ret:Function not implemented res:
[Parsed_sendcmd_0 @ 0x6000016709a0] Processing command #1 target:crop command:h arg:258
[Parsed_sendcmd_0 @ 0x6000016709a0] Command reply for command #1: ret:Function not implemented res:
[Parsed_sendcmd_0 @ 0x6000016709a0] Processing command #2 target:crop command:x arg:928
[Parsed_sendcmd_0 @ 0x6000016709a0] Command reply for command #2: ret:Function not implemented res:
[Parsed_sendcmd_0 @ 0x6000016709a0] Processing command #3 target:crop command:y arg:102
[Parsed_sendcmd_0 @ 0x6000016709a0] Command reply for command #3: ret:Function not implemented res:


  


  It resulted in no cropping of the video, it just gives the exact same frame

  


• extract subtitles from mp4 with ffmpeg [closed]

  15 février 2024, par Tom Tapas

  Can some one help me with this ?
Perhaps it's not even possible :
tom@Toms-MBP-50 SrtTest % ffmpeg -i Wraak.mp4
ffmpeg version 6.1.1 Copyright (c) 2000-2023 the FFmpeg developers
built with Apple clang version 15.0.0 (clang-1500.1.0.2.5)
configuration : —prefix=/opt/homebrew/Cellar/ffmpeg/6.1.1_3 —enable-shared —enable-pthreads —enable-version3 —cc=clang —host-cflags= —host-ldflags='-Wl,-ld_classic' —enable-ffplay —enable-gnutls —enable-gpl —enable-libaom —enable-libaribb24 —enable-libbluray —enable-libdav1d —enable-libharfbuzz —enable-libjxl —enable-libmp3lame —enable-libopus —enable-librav1e —enable-librist —enable-librubberband —enable-libsnappy —enable-libsrt —enable-libssh —enable-libsvtav1 —enable-libtesseract —enable-libtheora —enable-libvidstab —enable-libvmaf —enable-libvorbis —enable-libvpx —enable-libwebp —enable-libx264 —enable-libx265 —enable-libxml2 —enable-libxvid —enable-lzma —enable-libfontconfig —enable-libfreetype —enable-frei0r —enable-libass —enable-libopencore-amrnb —enable-libopencore-amrwb —enable-libopenjpeg —enable-libopenvino —enable-libspeex —enable-libsoxr —enable-libzmq —enable-libzimg —disable-libjack —disable-indev=jack —enable-videotoolbox —enable-audiotoolbox —enable-neon
libavutil 58. 29.100 / 58. 29.100
libavcodec 60. 31.102 / 60. 31.102
libavformat 60. 16.100 / 60. 16.100
libavdevice 60. 3.100 / 60. 3.100
libavfilter 9. 12.100 / 9. 12.100
libswscale 7. 5.100 / 7. 5.100
libswresample 4. 12.100 / 4. 12.100
libpostproc 57. 3.100 / 57. 3.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'Wraak.mp4' :
Metadata :
major_brand : mp42
minor_version : 0
compatible_brands : isommp42
creation_time : 2023-06-09T11:22:49.000000Z
Duration : 00:02:46.86, start : 0.000000, bitrate : 3494 kb/s
Stream #0:00x1 : Video : h264 (Baseline) (avc1 / 0x31637661), yuv420p(tv, progressive), 1280x720 [SAR 1:1 DAR 16:9], 3366 kb/s, 25 fps, 25 tbr, 25k tbn (default)
Metadata :
creation_time : 2023-06-09T11:22:50.000000Z
handler_name : Mainconcept MP4 Video Media Handler
vendor_id : [0][0][0][0]
encoder : AVC Coding
Stream #0:10x2 : Audio : aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 125 kb/s (default)
Metadata :
creation_time : 2023-06-09T11:22:50.000000Z
handler_name : Mainconcept MP4 Sound Media Handler
vendor_id : [0][0][0][0]
At least one output file must be specified

  


  ffmpeg -i Wraak.mp4 -map 0:0 subtitles.srt