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• ffmpeg codec conversion ; can't configure encoder

  8 mars 2019, par PerfectChaos7

  I am simply trying to convert a vp9 webm I have into a vp8 webm. this is the command I’m using.

  ffmpeg -i in.webm -c:v vp8 out.webm

  the vp8 encoder returns a strange error

  Input #0, matroska,webm, from 'in.webm':
  
    Metadata:
  
      encoder         : google
  
    Duration: 00:02:34.60, start: 0.000000, bitrate: 404 kb/s
  
      Stream #0:0(eng): Video: vp9 (Profile 0), yuv420p(tv, bt709/unknown/unknown), 640x360, SAR 1:1 DAR 16:9, 30 fps, 30 tbr, 1k tbn, 1k tbc (default)
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (vp9 (native) -> vp8 (vp8_v4l2m2m))
  
  Press [q] to stop, [?] for help
  
  [vp8_v4l2m2m @ 0x56195db9f9f0] Could not find a valid device
  
  [vp8_v4l2m2m @ 0x56195db9f9f0] can't configure encoder
  
  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!

  In case I get any questions about whether I have the right encoders and decoders installed here is the output of ffmpeg -codecs | grep "vp[8-9]" :

   DEV.L. vp8                  On2 VP8 (decoders: vp8 vp8_v4l2m2m vp8_cuvid ) (encoders: vp8_v4l2m2m )
  
   D.V.L. vp9                  Google VP9 (decoders: vp9 vp9_v4l2m2m vp9_cuvid )

• avcodec/libdav1d : route dav1d internal logs through av_log()

  1er mars 2019, par James Almer

  avcodec/libdav1d : route dav1d internal logs through av_log()
  Bump the minimum required version to the first one with the logger API callback.
  Reviewed-by : Vittorio Giovara <vittorio.giovara@gmail.com>
  
  Signed-off-by : James Almer <jamrial@gmail.com>
  

  • [DH] configure
  • [DH] libavcodec/libdav1d.c

• How to configure ffmpeg with libsrt (Secure Reliable Transport) protocol ?

  15 mars 2019, par Developer

  I want to configure ffmpeg with libsrt (Secure Reliable Transport) protocol on linux-Ubuntu OS, I followed the steps from this link

  But when run $./configure --enable-libsrt command it gives me an error :

  ERROR: srt >= 1.3.0 not found using pkg-config

  I modified the configuration file, it executed the above command but when i run $ make command it end up with the following errors :

  LD  ffmpeg_g
  
  libavformat/libavformat.so: undefined reference to `srt_socket'
  
  libavformat/libavformat.so: undefined reference to `srt_bind'
  
  libavformat/libavformat.so: undefined reference to `srt_getsockopt'
  
  libavformat/libavformat.so: undefined reference to `srt_close'
  
  libavformat/libavformat.so: undefined reference to `srt_epoll_add_usock'
  
  libavformat/libavformat.so: undefined reference to `srt_startup'
  
  libavformat/libavformat.so: undefined reference to `srt_connect'
  
  libavformat/libavformat.so: undefined reference to `srt_epoll_release'
  
  libavformat/libavformat.so: undefined reference to `srt_listen'
  
  libavformat/libavformat.so: undefined reference to `srt_getlasterror'
  
  libavformat/libavformat.so: undefined reference to `srt_getlasterror_str'
  
  libavformat/libavformat.so: undefined reference to `srt_cleanup'
  
  libavformat/libavformat.so: undefined reference to `srt_setsockopt'
  
  libavformat/libavformat.so: undefined reference to `srt_sendmsg'
  
  libavformat/libavformat.so: undefined reference to `srt_clearlasterror'
  
  libavformat/libavformat.so: undefined reference to `srt_epoll_wait'
  
  libavformat/libavformat.so: undefined reference to `srt_epoll_remove_usock'
  
  libavformat/libavformat.so: undefined reference to `srt_epoll_create'
  
  libavformat/libavformat.so: undefined reference to `srt_recvmsg'
  
  libavformat/libavformat.so: undefined reference to `srt_accept'
  
  collect2: error: ld returned 1 exit status
  
  Makefile:108: recipe for target 'ffmpeg_g' failed
  
  make: *** [ffmpeg_g] Error 1

  What are exact steps to enable libsrt with ffmpeg ? Am i missing anything ? Is there any patch i have to add to existing ffmpeg source ?

  Thanks in advance !!!