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• How to initialize the AV format context from NetworkStream rather than url ?

  23 juillet 2020, par Ahmad

  I'm using FFmpeg.AutoGen to encode catpured frames :
https://github.com/Ruslan-B/FFmpeg.AutoGen

  


  I send the encoded packets through NetworkStream to another program using TCP Client/Server application, using this code :

  


   //Send size and encoded packet
 _stream.Write(BitConverter.GetBytes(pPacket->size), 0, 4);
 using (var packetStream = new UnmanagedMemoryStream(pPacket->data, pPacket->size)) 
        packetStream.CopyTo(_stream);


  


  At the server-side, after UTF8 encoding, I receive content like this :

  


  


  gd ?r@ ?/ ?a 2&#xF;1 ?   h?C?,?  ????E???H??,? ?#??x264 - core 160 - H.264/MPEG-4 AVC codec - Copyleft 2003-2020 - http://www.videolan.org/x264.html - options: cabac=1 ref=16 deblock=1:0:0 analyse=0x3:0x133 me=umh subme=10 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=24 chroma_me=1 trellis=2 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=11 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=8 b_pyramid=2 b_adapt=2 b_bias=0 direct=3 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=60 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00 ?  e??   ??S?T????M?.O ??Ea???Q?OI??X?????[?P???42=h??M?K? ??{?@c;?t???Ke?>???? ?2 ??&#xB; ?\qXEvg ???U A ?X ??q/&#xB;(?? ?L ?_c ?g ?X ?c(To ?k ?Y ?-F ???R ?] ??U ?&#xA; ;|=r ????\U ???2 ?g ??> ??½ ?7 ?A&#xE; ?1W9 ???A ??&#xF; ?_L ??P ?) ?&#xF;M ????q/ ?L ??) : ??< ??8d/* ?&#xF; ?^ ??} ?B ?H ?_8C[y ???CY ?QM(J ???1<3% ?K ?F ;Q3Q ????&#xA; ??jy&#xF;J" ???y]k ?m ?^} ???S ????h ?&#xF;3 ????EP ???pw ???q ?jKp ???h ?????

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  My problem is, how to initialize the AV format context with this data, and decode the received packet to recover the original frame ?

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  _pFormatContext = ffmpeg.avformat_alloc_context();
ffmpeg.avformat_open_input(&pFormatContext, url, null, null).ThrowExceptionIfError();


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  As problem exactly is, ffmpeg.avformat_open_input takes URL as an input, not byte[]. If _pFormatContext can be initialized using the received data, things are resolved, but HOW ?

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• Failed setup for format dxva2_vld : hwaccel initialisation returned error

  13 juin 2023, par james

  My program is a video player based on ffmpeg implementation, enabling d3d11va and dxva2 hardware acceleration to decode video frames, play most of the video is normal, only a small part of the video will report this error, ffmpeg printed log as follows :&#xA;I:2023-06-13 15:34:53 ms:887:No decoder device for codec found&#xA;I:2023-06-13 15:34:53 ms:887:Failed setup for format dxva2_vld : hwaccel initialisation returned error.&#xA;I:2023-06-13 15:34:53 ms:888:Format dxva2_vld not usable, retrying get_format() without it.&#xA;I:2023-06-13 15:34:53 ms:888:decode_slice_header error&#xA;I:2023-06-13 15:34:53 ms:888:no frame !

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  If ffplay is used and d3d11va and dxva2 hardware acceleration is not enabled, the video can be played normally, and the printed video information is as follows :&#xA;PS D :\msys64\home\wangj\ffmpeg-4.4.1\buildout\bin> .\ffplay.exe -i D :\Desktop\13132023061300012_1_C1_34.mp4&#xA;ffplay version 4.4.1 Copyright (c) 2003-2021 the FFmpeg developers&#xA;configuration : —prefix=./buildout —arch=x86 —toolchain=msvc —enable-shared —disable-debug —enable-sdl2 —enable-dxva2 —enable-d3d11va&#xA;libavutil 56. 70.100 / 56. 70.100&#xA;libavcodec 58.134.100 / 58.134.100&#xA;libavformat 58. 76.100 / 58. 76.100&#xA;libavdevice 58. 13.100 / 58. 13.100&#xA;libavfilter 7.110.100 / 7.110.100&#xA;libswscale 5. 9.100 / 5. 9.100&#xA;libswresample 3. 9.100 / 3. 9.100&#xA;Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'D :\Desktop\13132023061300012_1_C1_34.mp4' :&#xA;Metadata :&#xA;major_brand : isom&#xA;minor_version : 512&#xA;compatible_brands : isomiso2avc1mp41&#xA;encoder : Lavf56.38.102&#xA;Duration : 00:00:44.00, start : 0.000000, bitrate : 1706 kb/s&#xA;Stream #0:0(und) : Video : h264 (Baseline) (avc1 / 0x31637661), yuv420p, 1920x1080, 1705 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc (default)&#xA;Metadata :&#xA;handler_name : VideoHandler&#xA;vendor_id : [0][0][0][0]

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  Is this pixel format not supported by d3d11va and dxva2 ? What can I do to get ffplay to play this video file with hardware acceleration ?

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  When d3d11va and dxva2 hardware acceleration is enabled, most of the videos that can be played also have yuv420p pixel format, why can't this video be played？

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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.

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  ./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"


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  This line :

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  -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? \


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  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.

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  However, the following switch :

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


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  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 ?

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

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  [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 --


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

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  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!


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