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• converting video with avconv while capturing

  31 mai 2017, par Oliver

  I am successfully capturing a video stream with that device :
  Easycap DC60

  But I need to run the following commands in serial :

  First that :

  sudo killall -9 somagic-both

  sudo killall -9 somagic-capture

  sudo somagic-init

  sudo somagic-both -n 1>.video 2>.audio

  [CTRL+C]

  Then that :

  avconv

  -f rawvideo -pix_fmt uyvy422 -r 30 -s:v 720x480 -i .video

  -f s16le -sample_rate 24000 -ac 2 -i .audio -strict experimental

  -vcodec mpeg4 -vtag xvid -qscale:v 7

  -vf yadif -s:v 720x540

  video.avi

  The problem is that when I try to run them together in a row (with "&" at the end of "sudo somagic-both -n 1>.video 2>.audio") I get that error :

  ffmpeg version 2.8.11-0ubuntu0.16.04.1 Copyright (c) 2000-2017 the FFmpeg developers
  
    built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.4) 20160609
  
    configuration: --prefix=/usr --extra-version=0ubuntu0.16.04.1 --build-suffix=-ffmpeg --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --cc=cc --cxx=g++ --enable-gpl --enable-shared --disable-stripping --disable-decoder=libopenjpeg --disable-decoder=libschroedinger --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librtmp --enable-libschroedinger --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxvid --enable-libzvbi --enable-openal --enable-opengl --enable-x11grab --enable-libdc1394 --enable-libiec61883 --enable-libzmq --enable-frei0r --enable-libx264 --enable-libopencv
  
    libavutil      54. 31.100 / 54. 31.100
  
    libavcodec     56. 60.100 / 56. 60.100
  
    libavformat    56. 40.101 / 56. 40.101
  
    libavdevice    56.  4.100 / 56.  4.100
  
    libavfilter     5. 40.101 /  5. 40.101
  
    libavresample   2.  1.  0 /  2.  1.  0
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  2.101 /  1.  2.101
  
    libpostproc    53.  3.100 / 53.  3.100
  
  Input #0, rawvideo, from '.video':
  
    Duration: N/A, bitrate: 165888 kb/s
  
      Stream #0:0: Video: rawvideo (UYVY / 0x59565955), uyvy422, 720x480, 165888 kb/s, 30 tbr, 30 tbn, 30 tbc
  
  [s16le @ 0x24d7480] Estimating duration from bitrate, this may be inaccurate
  
  Guessed Channel Layout for  Input Stream #1.0 : stereo
  
  Input #1, s16le, from '.audio':
  
    Duration: 00:00:00.71, bitrate: 767 kb/s
  
      Stream #1:0: Audio: pcm_s16le, 24000 Hz, 2 channels, s16, 768 kb/s
  
  File 'video.avi' already exists. Overwrite ? [y/N] y
  
  Output #0, avi, to 'video.avi':
  
    Metadata:
  
      ISFT            : Lavf56.40.101
  
      Stream #0:0: Video: mpeg4 (xvid / 0x64697678), yuv420p, 720x540, q=2-31, 200 kb/s, 30 fps, 30 tbn, 30 tbc
  
      Metadata:
  
        encoder         : Lavc56.60.100 mpeg4
  
      Stream #0:1: Audio: mp3 (libmp3lame) (U[0][0][0] / 0x0055), 24000 Hz, stereo, s16p
  
      Metadata:
  
        encoder         : Lavc56.60.100 libmp3lame
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (rawvideo (native) -> mpeg4 (native))
  
    Stream #1:0 -> #0:1 (pcm_s16le (native) -> mp3 (libmp3lame))
  
  Press [q] to stop, [?] for help
  
  Multiple frames in a packet from stream 0
  
  [pcm_s16le @ 0x24f33c0] Invalid PCM packet, data has size 2 but at least a size of 4 was expected
  
  Error while decoding stream #1:0: Invalid data found when processing input
  
  frame=    0 fps=0.0 q=0.0 Lsize=      38kB time=00:00:03.19 bitrate=  98.0kbits/s    
  
  video:0kB audio:25kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 50.802467%

  I think it happens because it is converting more quickly than it is capturing. I tried to use the solution given here
  without success.

  Anyone ever faced that situation before ?

• rtsp to rtmp using ffmpeg or any tool wrapper

  27 août 2017, par Chakri

  I have a requirement where I need to restream the RTSP stream from camera source to RTMP server. I know this may sound a repeated question but my exact scenario is I cannot do it manually over command line with ffmpeg command. I need a wrapper where I receive the rtsp and rtmp url from external source say through REST invocation. Then the code can trigger the ffmpeg restream.

  Basically flow is like this :

  1. Camera source application sends RTSP read event(could be basic HTTP(REST) request with RTSP url, metadata about camera info, serial no etc) to my streamer app

  Ex : /usr/bin/ffmpeg -i rtsp ://10.144.11.22:554/stream1 -f flv rtmp ://10.13.11.121:1935/stream1

  2. Streamer app computes the RTMP server url for corresponding camera and triggers a ffmpeg command to stream RTSP to RTMP

  3. Streamer app triggers above(2) in separate thread and keeps reading the logs for monitoring purpose. Also identifies the end of RTSP stream and sends an update(Example : RTSP END) event to UI

  Now at point(2) I need a suggestion. Here I need a stable wrapper/api which can help. I tried this through some Java wrappers but the process hangs or fails to read the output from ffmpeg. Also I need to handle streams from many cameras where spawning thread for each one could be exhaustive.

  So I am looking for some similar api/wrapper in C++ or Go Lang which might have more closer interaction in handling ffmpeg command.

  Please point if similar issue is addressed elsewhere

• Specify timestamp in ffmpeg video segment command

  25 mars 2019, par Soumya

  I have a continuous RTSP stream coming from a camera over the network.
  I want to dump the stream but in video files of length 1 min each.

  I an using the following command

  ffmpeg -i "rtsp://user:pass@example.com"  -f mp4 -r 12 -s 640x480 -ar 44100 \
  
  -ac 1 -segment_time 60 -segment_format mp4 "out%03d.mp4"

  The name of the files being created are of the form out001.mp4, out002.mp4, etc.

  I want to include the timestamp (hour and minute) in the name of the file segments eg. 09-30.mp4, 09-31.mp4, etc.

  If it is mandatory to provide a serial number for the segment, is it possible to get something like 09-30-001.mp4, 09-31-002.mp4 ?