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• how to use gl-transition in ffmpeg ?

  19 avril 2020, par Zedd

  I tried to use gl-transition with the following method.

  



  https://github.com/transitive-bullshit/ffmpeg-gl-transition

  



  But I followed the instructions many times without success.
I think it may be that this library is no longer maintained

  



  Is there any other way to use gl-transition in the form of ffmpeg filter ?

  


• streaming data with ffmpeg using pipe - stream never starts

  9 novembre 2022, par tamirg

  Im fetching some video data, and trying to stream it using ffmpeg. what i do is create an ffmpeg process, set it to get info from '-', and then when i fetch the video data i write it to the process STDIN.

  


  My issue is that the steaming procces sometimes starts, and sometimes doesnt start. it really seems random (will add the ffmpeg logs at the end).
But if i save the entire data into a file, and then use ffplay on that file, it works perfectly fine, all the time.

  


  So im guessing something in the data is causing some issues with ffmpeg usage with pipe. The logs indicate that there are some issues with the DTS, but i dont know if thats the reason that stream never plays, and what can be done to fix that.

  


  I cant really understand the issue from the logs, but maybe they indicate what is the issue exactly ?

  


  logs :

  


  When the stream proccess doesnt start and doesnt work, those are the logs :

  


  [mpeg @ 0x7fc7b63ef840] Format mpeg probed with size=262144 and score=52
[mpeg @ 0x7fc7b63ef840] Before avformat_find_stream_info() pos: 6 bytes read:263756 seeks:0 nb_streams:0
[NULL @ 0x7fc7b63eec00] nal_unit_type: 32(VPS), nuh_layer_id: 0, temporal_id: 0
[NULL @ 0x7fc7b63eec00] nal_unit_type: 33(SPS), nuh_layer_id: 0, temporal_id: 0
[NULL @ 0x7fc7b63eec00] nal_unit_type: 34(PPS), nuh_layer_id: 0, temporal_id: 0
[NULL @ 0x7fc7b63eec00] nal_unit_type: 19(IDR_W_RADL), nuh_layer_id: 0, temporal_id: 0
[NULL @ 0x7fc7b63eec00] Decoding VPS
[NULL @ 0x7fc7b63eec00] Main profile bitstream
[NULL @ 0x7fc7b63eec00] Decoding SPS
[NULL @ 0x7fc7b63eec00] Main profile bitstream
[NULL @ 0x7fc7b63eec00] Decoding VUI
[NULL @ 0x7fc7b63eec00] Decoding PPS
[extract_extradata @ 0x7fc7b63f2140] nal_unit_type: 32(VPS), nuh_layer_id: 0, temporal_id: 0
[extract_extradata @ 0x7fc7b63f2140] nal_unit_type: 33(SPS), nuh_layer_id: 0, temporal_id: 0
[extract_extradata @ 0x7fc7b63f2140] nal_unit_type: 34(PPS), nuh_layer_id: 0, temporal_id: 0
[extract_extradata @ 0x7fc7b63f2140] nal_unit_type: 19(IDR_W_RADL), nuh_layer_id: 0, temporal_id: 0
[hevc @ 0x7fc7b63eec00] nal_unit_type: 32(VPS), nuh_layer_id: 0, temporal_id: 0
[hevc @ 0x7fc7b63eec00] nal_unit_type: 33(SPS), nuh_layer_id: 0, temporal_id: 0
[hevc @ 0x7fc7b63eec00] nal_unit_type: 34(PPS), nuh_layer_id: 0, temporal_id: 0
[hevc @ 0x7fc7b63eec00] Decoding VPS
[hevc @ 0x7fc7b63eec00] Main profile bitstream
[hevc @ 0x7fc7b63eec00] Decoding SPS
[hevc @ 0x7fc7b63eec00] Main profile bitstream
[hevc @ 0x7fc7b63eec00] Decoding VUI
[hevc @ 0x7fc7b63eec00] Decoding PPS
[hevc @ 0x7fc7b63eec00] nal_unit_type: 32(VPS), nuh_layer_id: 0, temporal_id: 0
[hevc @ 0x7fc7b63eec00] nal_unit_type: 33(SPS), nuh_layer_id: 0, temporal_id: 0
[hevc @ 0x7fc7b63eec00] nal_unit_type: 34(PPS), nuh_layer_id: 0, temporal_id: 0
[hevc @ 0x7fc7b63eec00] Decoding VPS
[hevc @ 0x7fc7b63eec00] Main profile bitstream
[hevc @ 0x7fc7b63eec00] Decoding SPS
[hevc @ 0x7fc7b63eec00] Main profile bitstream
[hevc @ 0x7fc7b63eec00] Decoding VUI
[hevc @ 0x7fc7b63eec00] Decoding PPS
[mpeg @ 0x7fc7b63ef840] Non-increasing DTS in stream 1: packet 3 with DTS 150119711008467, packet 4 with DTS 150119711008467
[mpeg @ 0x7fc7b63ef840] Non-increasing DTS in stream 1: packet 5 with DTS 150119711008469, packet 6 with DTS 150119711008469
[hevc @ 0x7fc7b63eec00] nal_unit_type: 32(VPS), nuh_layer_id: 0, temporal_id: 0
[hevc @ 0x7fc7b63eec00] nal_unit_type: 33(SPS), nuh_layer_id: 0, temporal_id: 0
[hevc @ 0x7fc7b63eec00] nal_unit_type: 34(PPS), nuh_layer_id: 0, temporal_id: 0
[hevc @ 0x7fc7b63eec00] nal_unit_type: 19(IDR_W_RADL), nuh_layer_id: 0, temporal_id: 0
[hevc @ 0x7fc7b63eec00] Decoding VPS
[hevc @ 0x7fc7b63eec00] Main profile bitstream
[hevc @ 0x7fc7b63eec00] Decoding SPS
[hevc @ 0x7fc7b63eec00] Main profile bitstream
[hevc @ 0x7fc7b63eec00] Decoding VUI
[hevc @ 0x7fc7b63eec00] Decoding PPS


  


  After the last log line, nothing happens, and no more log lines appear.

  


  When the process actually starts and works fine, those are the logs :

  


  [mpeg @ 0x7f5475d69840] Format mpeg probed with size=524288 and score=52
[mpeg @ 0x7f5475d69840] Before avformat_find_stream_info() pos: 6 bytes read:526296 seeks:0 nb_streams:0
[mpeg @ 0x7f5475d69840] Non-increasing DTS in stream 1: packet 2 with DTS 150120249571596, packet 3 with DTS 150120249571596
[mpeg @ 0x7f5475d69840] Non-increasing DTS in stream 1: packet 4 with DTS 150120249571598, packet 5 with DTS 150120249571598
[mpeg @ 0x7f5475d69840] Non-increasing DTS in stream 1: packet 5 with DTS 150120249571598, packet 6 with DTS 150120249571598
[NULL @ 0x7f5475d68c00] nal_unit_type: 32(VPS), nuh_layer_id: 0, temporal_id: 0
[NULL @ 0x7f5475d68c00] nal_unit_type: 33(SPS), nuh_layer_id: 0, temporal_id: 0
[NULL @ 0x7f5475d68c00] nal_unit_type: 34(PPS), nuh_layer_id: 0, temporal_id: 0
[NULL @ 0x7f5475d68c00] nal_unit_type: 19(IDR_W_RADL), nuh_layer_id: 0, temporal_id: 0
[NULL @ 0x7f5475d68c00] Decoding VPS
[NULL @ 0x7f5475d68c00] Main profile bitstream
[NULL @ 0x7f5475d68c00] Decoding SPS
[NULL @ 0x7f5475d68c00] Main profile bitstream
[NULL @ 0x7f5475d68c00] Decoding VUI
[NULL @ 0x7f5475d68c00] Decoding PPS
[extract_extradata @ 0x7f5475d6c140] nal_unit_type: 32(VPS), nuh_layer_id: 0, temporal_id: 0
[extract_extradata @ 0x7f5475d6c140] nal_unit_type: 33(SPS), nuh_layer_id: 0, temporal_id: 0
[extract_extradata @ 0x7f5475d6c140] nal_unit_type: 34(PPS), nuh_layer_id: 0, temporal_id: 0
[extract_extradata @ 0x7f5475d6c140] nal_unit_type: 19(IDR_W_RADL), nuh_layer_id: 0, temporal_id: 0
[hevc @ 0x7f5475d68c00] nal_unit_type: 32(VPS), nuh_layer_id: 0, temporal_id: 0
[hevc @ 0x7f5475d68c00] nal_unit_type: 33(SPS), nuh_layer_id: 0, temporal_id: 0
[hevc @ 0x7f5475d68c00] nal_unit_type: 34(PPS), nuh_layer_id: 0, temporal_id: 0
[hevc @ 0x7f5475d68c00] Decoding VPS
[hevc @ 0x7f5475d68c00] Main profile bitstream
[hevc @ 0x7f5475d68c00] Decoding SPS
[hevc @ 0x7f5475d68c00] Main profile bitstream
[hevc @ 0x7f5475d68c00] Decoding VUI
[hevc @ 0x7f5475d68c00] Decoding PPS
[hevc @ 0x7f5475d68c00] nal_unit_type: 32(VPS), nuh_layer_id: 0, temporal_id: 0
[hevc @ 0x7f5475d68c00] nal_unit_type: 33(SPS), nuh_layer_id: 0, temporal_id: 0
[hevc @ 0x7f5475d68c00] nal_unit_type: 34(PPS), nuh_layer_id: 0, temporal_id: 0
[hevc @ 0x7f5475d68c00] Decoding VPS
[hevc @ 0x7f5475d68c00] Main profile bitstream
[hevc @ 0x7f5475d68c00] Decoding SPS
[hevc @ 0x7f5475d68c00] Main profile bitstream
[hevc @ 0x7f5475d68c00] Decoding VUI
[hevc @ 0x7f5475d68c00] Decoding PPS
[hevc @ 0x7f5475d68c00] nal_unit_type: 32(VPS), nuh_layer_id: 0, temporal_id: 0
[hevc @ 0x7f5475d68c00] nal_unit_type: 33(SPS), nuh_layer_id: 0, temporal_id: 0
[hevc @ 0x7f5475d68c00] nal_unit_type: 34(PPS), nuh_layer_id: 0, temporal_id: 0
[hevc @ 0x7f5475d68c00] nal_unit_type: 19(IDR_W_RADL), nuh_layer_id: 0, temporal_id: 0
[hevc @ 0x7f5475d68c00] Decoding VPS
[hevc @ 0x7f5475d68c00] Main profile bitstream
[hevc @ 0x7f5475d68c00] Decoding SPS
[hevc @ 0x7f5475d68c00] Main profile bitstream
[hevc @ 0x7f5475d68c00] Decoding VUI
[hevc @ 0x7f5475d68c00] Decoding PPS
[hevc @ 0x7f5475d68c00] nal_unit_type: 1(TRAIL_R), nuh_layer_id: 0, temporal_id: 0
    Last message repeated 1 times
[mpeg @ 0x7f5475d69840] Non-increasing DTS in stream 1: packet 10 with DTS 150120249571825, packet 11 with DTS 150120249571825
[hevc @ 0x7f5475d68c00] nal_unit_type: 1(TRAIL_R), nuh_layer_id: 0, temporal_id: 0
    Last message repeated 4 times
[mpeg @ 0x7f5475d69840] Non-increasing DTS in stream 1: packet 15 with DTS 150120249571844, packet 16 with DTS 150120249571844
[hevc @ 0x7f5475d68c00] nal_unit_type: 1(TRAIL_R), nuh_layer_id: 0, temporal_id: 0
    Last message repeated 7 times
[mpeg @ 0x7f5475d69840] Non-increasing DTS in stream 1: packet 25 with DTS 150120249571878, packet 26 with DTS 150120249571878
[hevc @ 0x7f5475d68c00] nal_unit_type: 1(TRAIL_R), nuh_layer_id: 0, temporal_id: 0
    Last message repeated 7 times
[mpeg @ 0x7f5475d69840] DTS discontinuity in stream 0: packet 23 with DTS 150120249572205, packet 24 with DTS 150120249610965
[hevc @ 0x7f5475d68c00] nal_unit_type: 1(TRAIL_R), nuh_layer_id: 0, temporal_id: 0
    Last message repeated 35 times
[hevc @ 0x7f5475d68c00] nal_unit_type: 32(VPS), nuh_layer_id: 0, temporal_id: 0
[hevc @ 0x7f5475d68c00] nal_unit_type: 33(SPS), nuh_layer_id: 0, temporal_id: 0
[hevc @ 0x7f5475d68c00] nal_unit_type: 34(PPS), nuh_layer_id: 0, temporal_id: 0
[hevc @ 0x7f5475d68c00] nal_unit_type: 19(IDR_W_RADL), nuh_layer_id: 0, temporal_id: 0
[hevc @ 0x7f5475d68c00] Decoding VPS
[hevc @ 0x7f5475d68c00] Main profile bitstream
[hevc @ 0x7f5475d68c00] Decoding SPS
[hevc @ 0x7f5475d68c00] Main profile bitstream
[hevc @ 0x7f5475d68c00] Decoding VUI
[hevc @ 0x7f5475d68c00] Decoding PPS
[hevc @ 0x7f5475d68c00] nal_unit_type: 1(TRAIL_R), nuh_layer_id: 0, temporal_id: 0
    Last message repeated 8 times
[mpeg @ 0x7f5475d69840] max_analyze_duration 5000000 reached at 5056000 microseconds st:1
[mpeg @ 0x7f5475d69840] After avformat_find_stream_info() pos: 1428588 bytes read:1428588 seeks:0 frames:152
Input #0, mpeg, from 'pipe:':
  Duration: N/A, start: 1668002773.015456, bitrate: N/A


  


  The main issue, is that it sometimes works, sometimes doesnt work.

  


  The ffmpeg proccess is just created by using asyncio.create_subprocess_exec

  


  Every time i get a video data, i pass the data to the proccess by calling ffmpeg_process.stdin.write(data)

  


  I believe the issue is with the data, since with video data, the whole pipeline works for me. But i cannot understand from the ffmpeg logs what is the issue exactly.

  


• FFMPEG trimming video (using select between) doesn't affect overall duration

  5 mai 2022, par srb7

  Completely new to working with FFMPEG, what I'm trying to achieve is applying overlaying graphics at certain positions and times, and cutting out sections of a single input video.

  


  I've worked out the overlaying graphics, so this code is working :

  


  ffmpeg -i /Users/username/projectdir/static/video.mp4 \
  -i overlay.png -i overlay2.png \
  -filter_complex "[0:v][1:v] overlay=192:108:enable='between(t, 0, 5)'[ov0]; 
                   [ov0] overlay=192:108:enable='between(t, 5, 10)'" \
  -pix_fmt yuv420p output_overlayed.mp4


  


  But when I try to cut out sections using this code :

  


  ffmpeg -i /Users/username/projectdir/static/video.mp4 \
  -i overlay.png -i overlay2.png \
  -filter_complex "[0:v][1:v] overlay=192:108:enable='between(t, 0, 5)'[ov0]; \
                   [ov0] overlay=192:108:enable='between(t, 5, 10)', \
                      select='between(t,0,5)+between(t,10,15)', \
                      setpts='N/FRAME_RATE/TB'" \
  -pix_fmt yuv420p output_overlayed_trimmed.mp4


  


  It seems to cut correctly, so the original video starts playing from 0 seconds until 5 seconds and then plays from 10 seconds in until 15 seconds and cuts out. But after the point where the video cuts out it's just a black screen for the duration of the video. I can't seem to get it to work so it affects the overall duration of the video.

  


  (The values being passed in are just examples by the way, eg. I've got it to start an overlay 5 seconds in but also cut 5 seconds in)

  


  I have the timestamps for when the overlays should appear on the non-trimmed video, so the overlaying should happen first and then the trimming. If the video is trimmed first then the overlays will appear at the wrong times.

  


  An alternative way of achieving this that is currently working is by performing the first line of code (which just produces a new video file with the overlay) and then separately take this new file and perform the trimming independently :

  


  ffmpeg -ss 0 -to 5 -i /Users/username/projectdir/static/output_overlayed.mp4 \
  -ss 15 -to 20 -i /Users/username/projectdir/static/output_overlayed.mp4 \
  -filter_complex "[0][1]concat=n=2:v=1:a=1" output_trimmed.mp4


  


  But this means working with 2 separate files and then having to remove the first after the 2nd execution is complete. Ideally I'd combine them into one command which doesn't produce multiple files.

  


  Would appreciate any help - thanks !