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• Mix audio to video changing volume of both video and audio FFMpeg

  12 septembre 2017, par 1234567

  Mix audio to video changing volume of both video and audio

  I want to reduce volume of (audio in video to 0.5 times original)

  and change

  volume of a second audio files to (2 times original)

  I am refering to this command

  ffmpeg -i video.webm -i audio.oga -filter_complex \
  
  "[0:a][1:a]amerge=inputs=2[a]" \
  
  -map 0:v -map "[a]" -c:v copy -c:a libvorbis -ac 2 -shortest out.webm

  from
  How to add a new audio (not mixing) into a video using ffmpeg ?

  also I dont have libvorbis, how can i use the same codec of the video for the new file

• fftools/ffmpeg : store forced keyframe pts in AV_TIME_BASE_Q

  17 novembre 2022, par Anton Khirnov

  fftools/ffmpeg : store forced keyframe pts in AV_TIME_BASE_Q
  Rather than the encoder timebase. Since the times are parsed as
  
  microseconds, this will not reduce precision, except possibly when
  
  chapter times are used and the chapter timebase happens to be better
  
  aligned with the encoder timebase, which is unlikely.
  This will allow parsing the keyframe times earlier (before encoder
  
  timebase is known) in future commits.
  

  • [DH] fftools/ffmpeg.c
  • [DH] fftools/ffmpeg.h

• rtmp can be played by ffplay, but video.js not

  8 novembre 2019, par Cat Tom

  I just run

  ffprobe -show_frames -i rtmp ://127.0.0.1:1935/live/0

  and I got :

  ffprobe version 4.1 Copyright (c) 2007-2018 the FFmpeg developers
  
    built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.10) 20160609
  
    configuration: --enable-shared --enable-libx264 --enable-sdl --enable-gpl
  
    libavutil      56. 22.100 / 56. 22.100
  
    libavcodec     58. 35.100 / 58. 35.100
  
    libavformat    58. 20.100 / 58. 20.100
  
    libavdevice    58.  5.100 / 58.  5.100
  
    libavfilter     7. 40.101 /  7. 40.101
  
    libswscale      5.  3.100 /  5.  3.100
  
    libswresample   3.  3.100 /  3.  3.100
  
    libpostproc    55.  3.100 / 55.  3.100
  
  [h264 @ 0xf5e400] Invalid NAL unit 0, skipping.
  
      Last message repeated 13 times
  
  [H264 Decoder @ 0xfb4e40] Broken frame packetizing
  
  [h264 @ 0xf5e400] top block unavailable for requested intra mode
  
  [h264 @ 0xf5e400] error while decoding MB 112 0
  
  [H264 Decoder @ 0xfb4e40] Broken frame packetizing
  
  [h264 @ 0xf5e400] illegal short term buffer state detected
  
  [h264 @ 0xf5e400] negative number of zero coeffs at 111 0
  
  [h264 @ 0xf5e400] error while decoding MB 111 0
  
  [H264 Decoder @ 0xfb4e40] Broken frame packetizing
  
  [h264 @ 0xf5e400] illegal short term buffer state detected
  
  [h264 @ 0xf5e400] Frame num change from 0 to 1
  
  [h264 @ 0xf5e400] decode_slice_header error
  
  [h264 @ 0xf5e400] Frame num change from 0 to 2
  
  [h264 @ 0xf5e400] decode_slice_header error
  
  [h264 @ 0xf5e400] illegal short term buffer state detected
  
  [H264 Decoder @ 0xfb4e40] Broken frame packetizing
  
  [h264 @ 0xf5e400] illegal short term buffer state detected
  
  [h264 @ 0xf5e400] Invalid NAL unit 8, skipping.
  
      Last message repeated 1 times
  
  [h264 @ 0xf5e400] Frame num change from 0 to 1
  
  [h264 @ 0xf5e400] decode_slice_header error
  
  [H264 Decoder @ 0xfb4e40] Broken frame packetizing
  
  [h264 @ 0xf5e400] Frame num change from 0 to 1
  
  [h264 @ 0xf5e400] decode_slice_header error
  
  [h264 @ 0xf5e400] Frame num change from 0 to 1
  
  [h264 @ 0xf5e400] decode_slice_header error
  
  [h264 @ 0xf5e400] concealing 3282 DC, 3282 AC, 3282 MV errors in I frame
  
  [h264 @ 0xf5e400] illegal short term buffer state detected
  
  [h264 @ 0xf5e400] Frame num change from 1 to 2
  
  [h264 @ 0xf5e400] decode_slice_header error
  
      Last message repeated 1 times
  
  [h264 @ 0xf5e400] Frame num change from 1 to 2
  
  [h264 @ 0xf5e400] decode_slice_header error
  
      Last message repeated 1 times
  
  [h264 @ 0xf5e400] Frame num change from 1 to 2
  
  [h264 @ 0xf5e400] decode_slice_header error
  
      Last message repeated 2 times
  
  [h264 @ 0xf5e400] Frame num change from 2 to 3
  
  [h264 @ 0xf5e400] decode_slice_header error
  
      Last message repeated 1 times

  It can be played with ffplay, but in video.js, it shows FLASH : rtmpconnectfailure ; I googled the message Frame num change from but didn’t get useful information, so how can I debug this and find a solution ?
  Any help would be appreciated, thank you !