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• ffmpeg video&audio streaming from webcam

  23 février 2016, par johncarrie

  I am new to ffmpeg and I want to stream webcam video&audio by using ffmpeg and ffserver.

  ffserver config is the following :

  <stream>
  
  Feed feed1.ffm
  
  Format avi
  
  VideoSize 176x128
  
  VideoFrameRate 15
  
  VideoBufferSize 40
  
  VideoBitRate 64
  
  AudioBitRate 32
  
  AudioChannels 1
  
  AudioSampleRate 11025
  
  VideoQMin 1
  
  VideoQMax 20
  
  NoDefaults
  
  </stream>

  ffmpeg process is the following :

  ffmpeg -vcodec mjpeg -v verbose -r 15 -s 176x128 -f video4linux2 -i /dev/video0 -f
  
   alsa -ac 1 -i hw:0 http://localhost:8090/feed1.ffm
  
  ffmpeg version N-77547-g2893dbf Copyright (c) 2000-2015 the FFmpeg developers
  
    built with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1~14.04)
  
    configuration: --prefix=/root/ffmpeg_build --extra-cflags=-I/root/ffmpeg_build/include --extra-ldflags=-L/root/ffmpeg_build/lib --bindir=/root/bin --extra-libs=-ldl --enable-gpl --enable-libass --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-nonfree --enable-x11grab
  
    libavutil      55. 11.100 / 55. 11.100
  
    libavcodec     57. 20.100 / 57. 20.100
  
    libavformat    57. 21.100 / 57. 21.100
  
    libavdevice    57.  0.100 / 57.  0.100
  
    libavfilter     6. 22.100 /  6. 22.100
  
    libswscale      4.  0.100 /  4.  0.100
  
    libswresample   2.  0.101 /  2.  0.101
  
    libpostproc    54.  0.100 / 54.  0.100
  
  [video4linux2,v4l2 @ 0xa6133a0] fd:3 capabilities:84000001
  
  [video4linux2,v4l2 @ 0xa6133a0] The V4L2 driver changed the video from 176x128 to 1280x720
  
  [mjpeg @ 0xa613ec0] Changing bps to 8
  
  Input #0, video4linux2,v4l2, from '/dev/video0':
  
    Duration: N/A, start: 77139.395765, bitrate: N/A
  
  Stream #0:0: Video: mjpeg, 1 reference frame, yuvj422p(pc, bt470bg/unknown/unknown), 1280x720, -2 kb/s, 15 fps, 15 tbr, 1000k tbn, 1000k tbc
  
  Guessed Channel Layout for  Input Stream #1.0 : mono
  
  Input #1, alsa, from 'hw:0':
  
    Duration: N/A, start: 1456086923.213492, bitrate: 768 kb/s
  
  Stream #1:0: Audio: pcm_s16le, 48000 Hz, 1 channels, s16, 768 kb/s
  
  [tcp @ 0xa622000] Connection to tcp://localhost:8090 failed (Connection refused), trying next address
  
  [tcp @ 0xa61e140] Connection to tcp://localhost:8090 failed (Connection refused), trying next address
  
  [graph 0 input from stream 1:0 @ 0xa613220] tb:1/48000 samplefmt:s16 samplerate:48000 chlayout:0x4
  
  [audio format for output stream 0:0 @ 0xa62a620] auto-inserting filter 'auto-inserted resampler 0' between the filter 'Parsed_anull_0' and the filter 'audio format for output stream 0:0'
  
  [auto-inserted resampler 0 @ 0xa6229c0] ch:1 chl:mono fmt:s16 r:48000Hz -> ch:1 chl:mono fmt:s32p r:11025Hz
  
  [graph 1 input from stream 0:0 @ 0xa6244c0] w:1280 h:720 pixfmt:yuvj422p tb:1/15 fr:15/1 sar:0/1 sws_param:flags=2
  
  [scaler for output stream 0:1 @ 0xa623fc0] w:176 h:128 flags:'bicubic' interl:0
  
  [graph 1 input from stream 0:0 @ 0xa6244c0] TB:0.066667 FRAME_RATE:15.000000 SAMPLE_RATE:nan
  
  [swscaler @ 0xa63fe40] deprecated pixel format used, make sure you did set range correctly
  
  [scaler for output stream 0:1 @ 0xa623fc0] w:1280 h:720 fmt:yuvj422p sar:0/1 -> w:176 h:128 fmt:yuv420p sar:0/1 flags:0x4
  
  [mpeg4 @ 0xa626260] Either both buffer size and max rate or neither must be specified
  
  Output #0, ffm, to 'http://localhost:8090/feed1.ffm':
  
    Metadata:
  
      creation_time   : 2016-02-22 03:35:23
  
      Stream #0:0: Audio: mp3 (libmp3lame), 11025 Hz, mono, s32p, 32 kb/s
  
      Metadata:
  
        encoder         : Lavc57.20.100 libmp3lame
  
      Stream #0:1: Video: mpeg4, 1 reference frame, none, 176x128 (0x0), q=1-20, 64 kb/s, 15 fps, 15 tbc
  
      Metadata:
  
        encoder         : Lavc57.20.100 mpeg4
  
  Stream mapping:
  
    Stream #1:0 -> #0:0 (pcm_s16le (native) -> mp3 (libmp3lame))
  
    Stream #0:0 -> #0:1 (mjpeg (native) -> mpeg4 (native))
  
  Error while opening encoder for output stream #0:1 - maybe incorrect parameters such as bit_rate, rate, width or height

  I am using a FEBON168 UVC HDMI GRABBER CARD as Webcam.
  USB UVC output is the following :
  1. MJPEG 1280x720 up to 30fps (full screen)
  2. YUV 1280x720 up to 10fps (full screen)

  How can I fix it ? What am I doing wrong ?

• ffmpeg save hls to m3u8 with mp4 segments

  9 juin 2018, par J. Omen

  I am looking for a command ffmpeg, which saving live input (rtmp or hls) to hls m3u8 with mp4 segments files. I know that it is possible to do, i.e. there is infohttps://bitmovin.com/hls-news-wwdc-2016/ but every command I tries - makes ts files. Anyone know solution ?

• lavf : add a protocol whitelist/blacklist for file opened internally

  20 janvier 2016, par Anton Khirnov

  lavf : add a protocol whitelist/blacklist for file opened internally
  Should make the default behaviour safer for careless callers that open
  
  random untrusted files.
  Bug-Id : CVE-2016-1897
  
  Bug-Id : CVE-2016-1898
  

  • [DBH] doc/APIchanges
  • [DBH] libavformat/avformat.h
  • [DBH] libavformat/aviobuf.c
  • [DBH] libavformat/options.c
  • [DBH] libavformat/options_table.h
  • [DBH] libavformat/rtsp.c
  • [DBH] libavformat/rtspdec.c
  • [DBH] libavformat/sapdec.c
  • [DBH] libavformat/sapenc.c
  • [DBH] libavformat/smoothstreamingenc.c
  • [DBH] libavformat/version.h