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• hwcontext_vaapi : remove duplicate formats from sw_format list

  24 juillet 2020, par Haihao Xiang

  hwcontext_vaapi : remove duplicate formats from sw_format list
  hwcontext_vaapi maps different VA fourcc to the same pix_fmt for U/V
  
  plane swap cases, however duplicate formats are not expected in sw_format
  
  list when merging formats.
  For example :
  
  ffmpeg -loglevel debug -init_hw_device vaapi -filter_hw_device vaapi0 \
  
   f lavfi -i smptebars -vf \
  
  "hwupload=derive_device=vaapi,scale_vaapi,hwdownload,format=yuv420p" \
  
   vframes 1 -f null -
  Without this fix, an auto scaler is required for the above command
  
     Duplicate formats in ff_merge_formats detected
  
     [auto_scaler_0 @ 0x560df58f4550] Setting 'flags' to value 'bicubic'
  
     [auto_scaler_0 @ 0x560df58f4550] w:iw h:ih flags :'bicubic' interl:0
  
     [Parsed_hwupload_0 @ 0x560df58f0ec0] auto-inserting filter
  
     'auto_scaler_0' between the filter 'graph 0 input from stream 0:0' and
  
     the filter 'Parsed_hwupload_0'
  Signed-off-by : Haihao Xiang <haihao.xiang@intel.com>
  

  • [DH] libavutil/hwcontext_vaapi.c

• Video overlay of several network inputs using ffmpeg

  1er juin 2018, par Hristo Ivanov

  I am writing my first program using the FFMPEG libraries, unfortunately it’s not a simple one.

  What I need is to :

  • capture several network inputs(udp).
  • demux the inputs.
  • overlay the video streams.
  • mix the audio(or some other logic).
  • encode the resulting streams.
  • remux the streams and write the result to file.

  For now I am playing with the ffmpeg.exe tool trying achieve this functionality. The command I have looks like this :

  .\ffmpeg.exe -threads auto -y -i input0 -i input1 \
  
      -filter_complex "[0:v]scale=1920x1080[v0];[1:v]scale=480x270[v1];[v0][v1]overlay=1440:810[v2]" \
  
      -map [v2] -map 0:a -c:v libx264 -preset ultrafast -c:a copy output.mp4

  When input0 and input1 are files the resulting output is correct, on the other hand, when the inputs are udp streams the resulting output is not correct, the video freezes most of the time.

  The file inputs are generated from the udp streams, using the following command :

  .\ffmpeg.exe -threads auto -y -i "udp://@ip:port" -c copy -f mpegts input1.mpg

  Question 1.
  Why is the above command not producing good ouput for udp streams ? What are the differences between the original stream and the dump of that stream for ffmpeg.exe.

  Question 2.
  Is there some argument/s that can fix the command ?

  Question 3.
  What kind of logic/algorithm is needed to correctly overlay two network streams.

• FFMPEG muxing overhead unknown creating HLS Live stream from mp4 files

  9 juillet 2021, par user72261

  I am using FFMPEG Concatenate to combine a number of mp4 files into a live HLS stream after around 40 seconds FFMPEG stops with error.

  


  I am working in PHP launching the FFMPEG command from there using exec as this project relies on users input from there own control panels.

  


  This is the error i am getting.

  


  ffmpeg version N-57204-gc7c138e411-static https://johnvansickle.com/ffmpeg/  Copyright (c) 2000-2021 the FFmpeg developers
  built with gcc 8 (Debian 8.3.0-6)
  configuration: --enable-gpl --enable-version3 --enable-static --disable-debug --disable-ffplay --disable-indev=sndio --disable-outdev=sndio --cc=gcc --enable-fontconfig --enable-frei0r --enable-gnutls --enable-gmp --enable-libgme --enable-gray --enable-libaom --enable-libfribidi --enable-libass --enable-libvmaf --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librubberband --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libvorbis --enable-libopus --enable-libtheora --enable-libvidstab --enable-libvo-amrwbenc --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libdav1d --enable-libxvid --enable-libzvbi --enable-libzimg
  libavutil      57.  0.100 / 57.  0.100
  libavcodec     59.  0.100 / 59.  0.100
  libavformat    59.  0.100 / 59.  0.100
  libavdevice    59.  0.100 / 59.  0.100
  libavfilter     8.  0.101 /  8.  0.101
  libswscale      6.  0.100 /  6.  0.100
  libswresample   4.  0.100 /  4.  0.100
  libpostproc    56.  0.100 / 56.  0.100
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x72fdcc0] Auto-inserting h264_mp4toannexb bitstream filter
Input #0, concat, from '/storage/($username)/hls/playlist.txt':
  Duration: N/A, start: 0.000000, bitrate: 1404 kb/s
  Stream #0:0(und): Video: h264 (Main) (avc3 / 0x33637661), yuv420p, 960x540 [SAR 1:1 DAR 16:9], 1183 kb/s, 25 fps, 25 tbr, 180k tbn
    Metadata:
      handler_name    : Edgeware Video Media Handler
      vendor_id       : [0][0][0][0]
  Stream #0:1(swe): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 221 kb/s
    Metadata:
      handler_name    : Edgeware Audio Media Handler
      vendor_id       : [0][0][0][0]
Output #0, hls, to '/storage/($username)/hls/playlist.m3u8':
  Metadata:
    encoder         : Lavf59.0.100
  Stream #0:0(und): Video: h264 (Main) (avc3 / 0x33637661), yuv420p, 960x540 [SAR 1:1 DAR 16:9], q=2-31, 1183 kb/s, 25 fps, 25 tbr, 90k tbn
    Metadata:
      handler_name    : Edgeware Video Media Handler
      vendor_id       : [0][0][0][0]
  Stream #0:1(swe): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 221 kb/s
    Metadata:
      handler_name    : Edgeware Audio Media Handler
      vendor_id       : [0][0][0][0]
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
  Stream #0:1 -> #0:1 (copy)
Press [q] to stop, [?] for help
frame=    1 fps=0.0 q=-1.0 size=N/A time=00:00:00.00 bitrate=N/A speed=   0x    
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7314640] Auto-inserting h264_mp4toannexb bitstream filter
[hls @ 0x7303800] Opening '/storage/($username)/hls/69426_0.ts' for writing
[hls @ 0x7303800] Opening '/storage/($username)/hls/playlist.m3u8.tmp' for writing
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7300740] Auto-inserting h264_mp4toannexb bitstream filter
[hls @ 0x7303800] Opening '/storage/($username)/hls/69426_1.ts' for writing
[hls @ 0x7303800] Opening '/storage/($username)/hls/playlist.m3u8.tmp' for writing
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7313e40] Auto-inserting h264_mp4toannexb bitstream filter
[hls @ 0x7303800] Opening '/storage/($username)/hls/69426_2.ts' for writing
[hls @ 0x7303800] Opening '/storage/($username)/hls/playlist.m3u8.tmp' for writing
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7313e40] Auto-inserting h264_mp4toannexb bitstream filter
[hls @ 0x7303800] Opening '/storage/($username)/hls/69426_3.ts' for writing
[hls @ 0x7303800] Opening '/storage/($username)/hls/playlist.m3u8.tmp' for writing
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7313e40] Auto-inserting h264_mp4toannexb bitstream filter
[hls @ 0x7303800] Opening '/storage/($username)/hls/69426_4.ts' for writing
[hls @ 0x7303800] Opening '/storage/($username)/hls/playlist.m3u8.tmp' for writing
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7313e40] Auto-inserting h264_mp4toannexb bitstream filter
[hls @ 0x7303800] Opening '/storage/($username)/hls/69426_5.ts' for writing
[hls @ 0x7303800] Opening '/storage/($username)/hls/playlist.m3u8.tmp' for writing
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7313e40] Auto-inserting h264_mp4toannexb bitstream filter
[hls @ 0x7303800] Opening '/storage/($username)/hls/69426_6.ts' for writing
[hls @ 0x7303800] Opening '/storage/($username)/hls/playlist.m3u8.tmp' for writing
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7313e40] Auto-inserting h264_mp4toannexb bitstream filter
[hls @ 0x7303800] Opening '/storage/($username)/hls/69426_7.ts' for writing
[hls @ 0x7303800] Opening '/storage/($username)/hls/playlist.m3u8.tmp' for writing
[hls @ 0x7303800] Opening '/storage/($username)/hls/69426_8.ts' for writing
[hls @ 0x7303800] Opening '/storage/($username)/hls/playlist.m3u8.tmp' for writing
[hls @ 0x7303800] Opening '/storage/($username)/hls/69426_9.ts' for writing
[hls @ 0x7303800] Opening '/storage/($username)/hls/playlist.m3u8.tmp' for writing
frame=  900 fps=0.0 q=-1.0 Lsize=N/A time=00:00:36.03 bitrate=N/A speed= 268x    
video:7232kB audio:973kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown


  


  This is the FFMPEG command i am running

  


  exec('ffmpeg -y -nostdin -hide_banner -re -f concat -safe 0 -i "' . $CONCAT_FILE . '" -c copy -f hls -start_number 0 -hls_init_time 4 -hls_time 4 -hls_list_size 8 -hls_segment_type mpegts -hls_allow_cache 0 -hls_flags delete_segments+discont_start -hls_segment_filename "' . $SEGMENT_FORMAT . '" "' . $PLAYLIST_NAME . '" );


  


  All mp4 files are encoded to h264 with the same specifications and if the video has audio it is encoded to aac.

  


  I am also using the latest version of the FFMPEG binary for linux.

  


  Has anyone else faced this issue ?