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• How to specify a non default type when calling a FFmpeg library using ctypes

  1er août 2013, par Jim Ramberg

  I am calling an FFMPEG library called avformat_alloc_context() that returns a pointer to type AVFormatContext. The structure AVFormatContext is defined in the avformat library.

  Obviously ; this is not one ctypes default types and results in an error when I try to pass a reference to it to another ffmpeg library further down in my code.

  Is there a way to add in the the classes defined inside of the library ? I read through what documentation I could find online and was not able to find a good answer to this question.

• android ffmpeg halfninja Could not find input stream matching output stream

  2 octobre 2013, par Nguyen

  I need your help about Android FFMPEG .

  I tried to run halfninja's projectTest but some errors are occurred.

  First error is occurred and it has been fixed by following suggestion : android ffmpeg halfninja av_open_input_file returns -2 (no such file or directory)

  Then after run again, I have this error :

  10-03 00:38:48.070 : E/Videokit(10474) : Could not find input stream matching output stream #0.0

  Full error :

  10-03 00:38:47.340 : E/Videokit(10474) : ffmpeg version N-30996-gf925b24, Copyright (c) 2000-2011 the FFmpeg developers
  10-03 00:38:47.340 : E/Videokit(10474) : built on Oct 2 2013 10:32:27 with gcc 4.4.3
  10-03 00:38:47.340 : E/Videokit(10474) : configuration : —enable-cross-compile —arch=arm5te —enable-armv5te —target-os=linux —disable-stripping —prefix=../output —disable-neon —enable-version3 —disable-shared —enable-static —enable-gpl —enable-memalign-hack —cc=arm-linux-androideabi-gcc —ld=arm-linux-androideabi-ld —extra-cflags='-fPIC -DANDROID -D_thumb_ -mthumb -Wfatal-errors -Wno-deprecated' —disable-everything —enable-decoder=mjpeg —enable-demuxer=mjpeg —enable-parser=mjpeg —enable-demuxer=image2 —enable-muxer=mp4 —enable-encoder=libx264 —enable-libx264 —enable-decoder=rawvideo —enable-protocol=file —enable-hwaccels —disable-ffmpeg —disable-ffplay —disable-ffprobe —disable-ffserver —disable-network —enable-filter=buffer —enable-filter=buffersink —disable-demuxer=v4l —disable-demuxer=v4l2 —disable-indev=v4l —disable-indev=v4l2 —extra-cflags='-I../x264 -Ivideokit' —extra-ldflags=-L../x264
  10-03 00:38:48.070 : E/Videokit(10474) : Could not find input stream matching output stream #0.0
  10-03 00:38:48.070 : E/Videokit(10474) : ffmpeg_exit(1) called !

  please help me.Thanks so much

• how to use ffmpeg with mjpeg_vaapi encoder (with hardware acceleration) ?

  8 août 2018, par Marat

  When I use ffmpeg with mjpeg encoder without hardware acceleration, everything works fine. I use following command :

  ffmpeg -nostdin -rtsp_transport udp_multicast -allowed_media_types 'video' -i 'rtsp://MYIP' -ss 00:00:0.00 -f image2pipe -q:v 24 -vf scale=-2:480,format=yuv420p -c:v mjpeg -vframes 1 pipe:1

  But, when I try to use mjpeg with hardware acceleration, I always get error :

  ffmpeg -nostdin -rtsp_transport udp_multicast -allowed_media_types 'video' -hwaccel vaapi -vaapi_device /dev/dri/renderD128 -hwaccel_output_format vaapi -i 'rtsp://MYIP' -ss 00:00:0.00 -f image2pipe -q:v 24 -vf scale=-2:480,format=yuv420p -c:v mjpeg_vaapi -vframes 1 pipe:1
  
  ffmpeg version N-91514-gc51e0cd Copyright (c) 2000-2018 the FFmpeg developers
  
    built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.10) 20160609
  
    configuration: --pkg-config-flags=--static
  
    libavutil      56. 18.102 / 56. 18.102
  
    libavcodec     58. 21.106 / 58. 21.106
  
    libavformat    58. 17.101 / 58. 17.101
  
    libavdevice    58.  4.101 / 58.  4.101
  
    libavfilter     7. 26.100 /  7. 26.100
  
    libswscale      5.  2.100 /  5.  2.100
  
    libswresample   3.  2.100 /  3.  2.100
  
  libva info: VA-API version 0.39.0
  
  libva info: va_getDriverName() returns 0
  
  libva info: Trying to open /usr/lib/x86_64-linux-gnu/dri/i965_drv_video.so
  
  libva info: Found init function __vaDriverInit_0_39
  
  libva info: va_openDriver() returns 0
  
  Input #0, rtsp, from 'rtsp://MYIP':
  
    Metadata:
  
      title           : Session streamed with GStreamer
  
      comment         : rtsp-server
  
    Duration: N/A, start: 0.180600, bitrate: N/A
  
      Stream #0:0: Video: h264 (Main), yuvj420p(pc, progressive), 800x600, 50 fps, 50 tbr, 90k tbn, 100 tbc
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (h264 (native) -> mjpeg (mjpeg_vaapi))
  
  Impossible to convert between the formats supported by the filter 'graph 0 input from stream 0:0' and the filter 'auto_scaler_0'
  
  Error reinitializing filters!
  
  Failed to inject frame into filter network: Function not implemented
  
  Error while processing the decoded data for stream #0:0
  
  Conversion failed!

  I tried with some additional options but it still keeps failing :

  ffmpeg -nostdin -rtsp_transport udp_multicast -allowed_media_types 'video' -hwaccel vaapi -vaapi_device /dev/dri/renderD128 -hwaccel_output_format vaapi -i 'rtsp://MYIP' -ss 00:00:0.00 -f image2pipe -q:v 24 -vf "scale_vaapi=w=800:h=600" -b:v 700k -r 25 -vcodec mjpeg_vaapi -vframes 1 pipe:1                
  
  ffmpeg version N-91514-gc51e0cd Copyright (c) 2000-2018 the FFmpeg developers
  
    built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.10) 20160609
  
    configuration: --pkg-config-flags=--static
  
    libavutil      56. 18.102 / 56. 18.102
  
    libavcodec     58. 21.106 / 58. 21.106
  
    libavformat    58. 17.101 / 58. 17.101
  
    libavdevice    58.  4.101 / 58.  4.101
  
    libavfilter     7. 26.100 /  7. 26.100
  
    libswscale      5.  2.100 /  5.  2.100
  
    libswresample   3.  2.100 /  3.  2.100
  
  libva info: VA-API version 0.39.0
  
  libva info: va_getDriverName() returns 0
  
  libva info: Trying to open /usr/lib/x86_64-linux-gnu/dri/i965_drv_video.so
  
  libva info: Found init function __vaDriverInit_0_39
  
  libva info: va_openDriver() returns 0
  
  Input #0, rtsp, from 'rtsp://MYIP':
  
    Metadata:
  
      title           : Session streamed with GStreamer
  
      comment         : rtsp-server
  
    Duration: N/A, start: 0.179933, bitrate: N/A
  
      Stream #0:0: Video: h264 (Main), yuvj420p(pc, progressive), 800x600, 50 fps, 50 tbr, 90k tbn, 100 tbc
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (h264 (native) -> mjpeg (mjpeg_vaapi))
  
  [mjpeg_vaapi @ 0x374cd80] Encoding entrypoint not found (12 / 7).
  
  Error initializing output stream 0:0 -- Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height
  
  Conversion failed!

  Can please anyone suggest right options to make it work ?