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• FFMPEG Optional Entries in -var_stream_map

  16 juillet 2022, par Baa

  I have a script that records an x11 display and outputs three HLS streams.

  



  ./ffmpeg -y \
    -f x11grab -framerate 60 -s 1920x1080 -i :1.0 \
    -c:v:0 libx264 -c:s:0 copy -c:a:0 aac -b:v:0 4000k -b:a:0 512k -s:v:0 1920x1080 -r:0 30 -g:0 90 -preset:0 superfast -tune:0 zerolatency -level:v:0 4 -f flv \
    -c:v:1 libx264 -c:s:1 copy -c:a:1 aac -b:v:1 2500k -b:a:1 256k -s:v:1 1280x720 -r:1 30 -g:1 90 -preset:1 superfast -tune:1 zerolatency -level:v:1 4 -f flv \
    -c:v:2 libx264 -c:s:2 copy -c:a:2 aac -b:v:2 800k -b:a:2 256k -s:v:2 960x540 -r:2 30 -g:2 90 -preset:2 superfast -tune:2 zerolatency -level:v:2 4 -f flv \
    -hls_time 6 \
    -hls_list_size 2 \
    -hls_flags delete_segments \
    -map 0:v -map 0:a? -map 0:s? -map 0:v -map 0:a? -map 0:s? -map 0:v -map 0:a? -map 0:s? \
    -var_stream_map "v:0,a:0 v:1,a:1 v:2,a:2" \
    -f hls -master_pl_name "${name}.m3u8" \
    -hls_segment_filename "/tmp/hls/${name}_%v-%d.ts" \
    -max_muxing_queue_size 1024 \
    "/tmp/hls/${name}_%v.m3u8"


  



  This line :

  



  -map 0:v -map 0:a? -map 0:s? -map 0:v -map 0:a? -map 0:s? -map 0:v -map 0:a? -map 0:s? \


  



  Has question marks after each 0:a, this is because the input does not always have audio, so it ignores the error when there is no audio present, and maps it when there is.

  



  However, the following switch :

  



  -var_stream_map "v:0,a:0 v:1,a:1 v:2,a:2" \


  



  Will only work if there is audio present, is there a way I can have -var_stream_map with entries that will ignore errors like -map does ?

  



  Here are the errors if I try to use this current script with no audio :

  



  [hls @ 0x6231800] Unable to map stream at a:0
[hls @ 0x6231800] Variant stream info update failed with status ffffffea
Could not write header for output file #0 (incorrect codec parameters ?): Invalid argument
Error initializing output stream 0:2 --


  



  If it's relevant, here is the entire output :

  



  ffmpeg version 4.0.3-static https://johnvansickle.com/ffmpeg/  Copyright (c) 2000-2018 the FFmpeg developers
  built with gcc 6.3.0 (Debian 6.3.0-18+deb9u1) 20170516
  configuration: --enable-gpl --enable-version3 --enable-static --disable-debug --disable-ffplay --disable-indev=sndio --disable-outdev=sndio --cc=gcc-6 --enable-fontconfig --enable-frei0r --enable-gnutls --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-libvorbis --enable-libopus --enable-libtheora --enable-libvidstab --enable-libvo-amrwbenc --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzimg
  libavutil      56. 14.100 / 56. 14.100
  libavcodec     58. 18.100 / 58. 18.100
  libavformat    58. 12.100 / 58. 12.100
  libavdevice    58.  3.100 / 58.  3.100
  libavfilter     7. 16.100 /  7. 16.100
  libswscale      5.  1.100 /  5.  1.100
  libswresample   3.  1.100 /  3.  1.100
  libpostproc    55.  1.100 / 55.  1.100
[x11grab @ 0x6229300] 16 bits per pixel screen is not implemented. Update your FFmpeg version to the newest one from Git. If the problem still occurs, it means that your file has a feature which has not been implemented.
[x11grab @ 0x6229300] Stream #0: not enough frames to estimate rate; consider increasing probesize
Input #0, x11grab, from ':1.0':
  Duration: N/A, start: 1546439595.240575, bitrate: N/A
    Stream #0:0: Video: rawvideo (RGB[16] / 0x10424752), rgb565le, 1920x1080, 60 fps, 1000k tbr, 1000k tbn, 1000k tbc
Stream mapping:
  Stream #0:0 -> #0:0 (rawvideo (native) -> h264 (libx264))
  Stream #0:0 -> #0:1 (rawvideo (native) -> h264 (libx264))
  Stream #0:0 -> #0:2 (rawvideo (native) -> h264 (libx264))
Press [q] to stop, [?] for help
[libx264 @ 0x62334c0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
[libx264 @ 0x62334c0] profile High 4:4:4 Predictive, level 4.0, 4:4:4, 8-bit
[libx264 @ 0x62334c0] 264 - core 157 r2935 545de2f - H.264/MPEG-4 AVC codec - Copyleft 2003-2018 - http://www.videolan.org/x264.html - options: cabac=1 ref=1 deblock=1:0:0 analyse=0x1:0x1 me=dia subme=1 psy=1 psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=1 trellis=0 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=6 threads=4 lookahead_threads=4 sliced_threads=1 slices=4 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=1 keyint=90 keyint_min=9 scenecut=40 intra_refresh=0 rc=abr mbtree=0 bitrate=4000 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
[libx264 @ 0x6234840] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
[libx264 @ 0x6234840] profile High 4:4:4 Predictive, level 4.0, 4:4:4, 8-bit
[libx264 @ 0x6234840] 264 - core 157 r2935 545de2f - H.264/MPEG-4 AVC codec - Copyleft 2003-2018 - http://www.videolan.org/x264.html - options: cabac=1 ref=1 deblock=1:0:0 analyse=0x1:0x1 me=dia subme=1 psy=1 psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=1 trellis=0 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=6 threads=4 lookahead_threads=4 sliced_threads=1 slices=4 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=1 keyint=90 keyint_min=9 scenecut=40 intra_refresh=0 rc=abr mbtree=0 bitrate=2500 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
[libx264 @ 0x6235740] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
[libx264 @ 0x6235740] profile High 4:4:4 Predictive, level 4.0, 4:4:4, 8-bit
[libx264 @ 0x6235740] 264 - core 157 r2935 545de2f - H.264/MPEG-4 AVC codec - Copyleft 2003-2018 - http://www.videolan.org/x264.html - options: cabac=1 ref=1 deblock=1:0:0 analyse=0x1:0x1 me=dia subme=1 psy=1 psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=1 trellis=0 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=6 threads=4 lookahead_threads=4 sliced_threads=1 slices=4 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=1 keyint=90 keyint_min=9 scenecut=40 intra_refresh=0 rc=abr mbtree=0 bitrate=800 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
[hls @ 0x6231800] Unable to map stream at a:0
[hls @ 0x6231800] Variant stream info update failed with status ffffffea
Could not write header for output file #0 (incorrect codec parameters ?): Invalid argument
Error initializing output stream 0:2 -- 
[libx264 @ 0x62334c0] frame I:1     Avg QP:31.45  size: 91065
[libx264 @ 0x62334c0] mb I  I16..4: 56.4%  0.0% 43.6%
[libx264 @ 0x62334c0] final ratefactor: 36.79
[libx264 @ 0x62334c0] coded y,u,v intra: 42.4% 8.7% 11.4%
[libx264 @ 0x62334c0] i16 v,h,dc,p: 53% 32% 11%  5%
[libx264 @ 0x62334c0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 28% 20% 14%  8%  6%  6%  6%  5%  6%
[libx264 @ 0x62334c0] kb/s:21855.60
[libx264 @ 0x6234840] frame I:1     Avg QP:30.27  size: 62907
[libx264 @ 0x6234840] mb I  I16..4: 48.6%  0.0% 51.4%
[libx264 @ 0x6234840] final ratefactor: 35.22
[libx264 @ 0x6234840] coded y,u,v intra: 53.9% 14.2% 17.2%
[libx264 @ 0x6234840] i16 v,h,dc,p: 49% 36% 11%  5%
[libx264 @ 0x6234840] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 26% 19% 15%  8%  7%  6%  6%  6%  6%
[libx264 @ 0x6234840] kb/s:15097.68
[libx264 @ 0x6235740] final ratefactor: 29.77
Conversion failed!


  


• FFPLAY read mp4 file from HTTP sever : report error : stream 1, offset 0x1c33 : partial file

  25 mai 2018, par whmiao

  I use command line like :

  ffplay http://192.168.4.56:5656/files/video/failed_111.mp4

  output :
  ffplay version N-87130-g2b9fd15 Copyright (c) 2003-2017 the FFmpeg developers
  built with gcc 7.1.0 (GCC)
  configuration : —enable-gpl —enable-version3 —enable-cuda —enable-cuvid —enable-d3d11va —enable-dxva2 —enable-libmfx —enable-nvenc —enable-avisynth —enable-bzlib —enable-fontconfig —enable-frei0r —enable-gnutls —enable-iconv —enable-libass —enable-libbluray —enable-libbs2b —enable-libcaca —enable-libfreetype —enable-libgme —enable-libgsm —enable-libilbc —enable-libmodplug —enable-libmp3lame —enable-libopencore-amrnb —enable-libopencore-amrwb —enable-libopenh264 —enable-libopenjpeg —enable-libopus —enable-librtmp —enable-libsnappy —enable-libsoxr —enable-libspeex —enable-libtheora —enable-libtwolame —enable-libvidstab —enable-libvo-amrwbenc —enable-libvorbis —enable-libvpx —enable-libwavpack —enable-libwebp —enable-libx264 —enable-libx265 —enable-libxavs —enable-libxvid —enable-libzimg —enable-lzma —enable-zlib
  libavutil 55. 74.100 / 55. 74.100
  libavcodec 57.104.100 / 57.104.100
  libavformat 57. 79.100 / 57. 79.100
  libavdevice 57. 8.100 / 57. 8.100
  libavfilter 6.101.100 / 6.101.100
  libswscale 4. 7.103 / 4. 7.103
  libswresample 2. 8.100 / 2. 8.100
  libpostproc 54. 6.100 / 54. 6.100
  [mov,mp4,m4a,3gp,3g2,mj2 @ 00000000025048e0] stream 1, offset 0x1c33 : partial file
  [mov,mp4,m4a,3gp,3g2,mj2 @ 00000000025048e0] Could not find codec parameters for stream 0 (Video : h264 (avc1 / 0x31637661), none(tv, bt709), 544x960, 1140 kb/s) : unspecified pixel format
  Consider increasing the value for the ’analyzeduration’ and ’probesize’ options

  I download the file,Open local storage,It works well,like :

  ffplay e:\failed_111.mp4

  file can download from :
  https://pan.baidu.com/s/19H9cl3YAjG-AK60nIn0KzQ

• ffmpeg API : handle frame loss in hevc encoding

  8 janvier 2024, par Mario

  Everything works fine until the introduction of frame->pts increment due to frame loss.

  


  Below is the regular progression without frame->pts increments :

  


  


  frame->pts=8 pkt->pts=512 pkt->dts=-512 pkt->flags=1
  
frame->pts=9 pkt->pts=2560 pkt->dts=0 pkt->flags=0
  
frame->pts=10 pkt->pts=1536 pkt->dts=512 pkt->flags=0
  
frame->pts=11 pkt->pts=1024 pkt->dts=1024 pkt->flags=0
  
frame->pts=12 pkt->pts=2048 pkt->dts=1536 pkt->flags=0
  
frame->pts=13 pkt->pts=4608 pkt->dts=2048 pkt->flags=0
  
frame->pts=14 pkt->pts=3584 pkt->dts=2560 pkt->flags=0
  
frame->pts=15 pkt->pts=3072 pkt->dts=3072 pkt->flags=0
  
frame->pts=16 pkt->pts=4096 pkt->dts=3584 pkt->flags=0
  
frame->pts=17 pkt->pts=6656 pkt->dts=4096 pkt->flags=0
  
frame->pts=18 pkt->pts=5632 pkt->dts=4608 pkt->flags=0

  


  


  When I introduce the frame->pts increment it happens :

  


  


  frame->pts=15 pkt->pts=512 pkt->dts=-512 pkt->flags=1
  
frame->pts=17 pkt->pts=4608 pkt->dts=2048 pkt->flags=0
  
frame->pts=19 pkt->pts=2560 pkt->dts=1536 pkt->flags=0
  
[mp4 @ 0x7eff842222c0] Application provided invalid, non monotonically increasing dts to muxer in stream 0 : 2048 >= 1536

  


  


  So I wrote the following code as a "quick" solution (between av_packet_rescale_ts() and av_interleaved_write_frame()) :

  


     av_packet_rescale_ts(pkt, c->time_base, st->time_base);  
   ...
   if (pkt->dts<=previous_dts)  
     {  
      if (pkt->pts<=previous_pts)  
        {  
         pkt->pts=previous_dts+1+pkt->pts-pkt->dts;  
        }  
       pkt->dts=previous_dts+1;  
     }  
   previous_dts=pkt->dts;  
   previous_pts=pkt->pts;  
   ...
   ret = av_interleaved_write_frame(fmt_ctx, pkt);  


  


  Now I no longer have the error, but the values are :

  


  


  frame->pts=15 pkt->pts=512 pkt->dts=-512 pkt->flags=1
  
changed frame->pts=15 pkt->pts=512 pkt->dts=1 pkt->flags=1
  
frame->pts=17 pkt->pts=4608 pkt->dts=2048 pkt->flags=0
  
frame->pts=19 pkt->pts=2560 pkt->dts=1536 pkt->flags=0
  
changed frame->pts=19 pkt->pts=3073 pkt->dts=2049 pkt->flags=0
  
frame->pts=21 pkt->pts=1536 pkt->dts=1536 pkt->flags=0
  
changed frame->pts=21 pkt->pts=2050 pkt->dts=2050 pkt->flags=0
  
frame->pts=23 pkt->pts=4096 pkt->dts=3584 pkt->flags=0
  
frame->pts=25 pkt->pts=8704 pkt->dts=6144 pkt->flags=0
  
frame->pts=27 pkt->pts=6656 pkt->dts=5632 pkt->flags=0
  
changed frame->pts=27 pkt->pts=7169 pkt->dts=6145 pkt->flags=0
  
frame->pts=29 pkt->pts=5632 pkt->dts=5632 pkt->flags=0
  
changed frame->pts=29 pkt->pts=6146 pkt->dts=6146 pkt->flags=0
  
frame->pts=31 pkt->pts=7680 pkt->dts=7168 pkt->flags=0
  
frame->pts=33 pkt->pts=12800 pkt->dts=10240 pkt->flags=0
  
frame->pts=35 pkt->pts=10752 pkt->dts=9728 pkt->flags=0
  
changed frame->pts=35 pkt->pts=11265 pkt->dts=10241 pkt->flags=0
  
frame->pts=37 pkt->pts=9728 pkt->dts=9728 pkt->flags=0
  
changed frame->pts=37 pkt->pts=10242 pkt->dts=10242 pkt->flags=0

  


  


  What is the correct way to handle frame loss scenario ?
Is there a way to inform the encoder about frame loss ?

  


  The encoder is "hevc_qsv" and the output format is mov (.mp4).