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• configure : Fix handling of _select dependencies

  24 mai 2017, par Diego Biurrun

  configure : Fix handling of _select dependencies
  The handling of _select dependencies had two issues :
  1) extralibs from _select dependencies of a component were not added to
  
     the list of extralibs for that component.
  
  2) extralibs from dependencies were only added to the extralibs of a
  
     component if the component was enabled. This led to incorrect results
  
     if that component was enabled by another component later in the dependency
  
     resolution process. Instead, always generate the full list of component
  
     extralibs for use later in the dependency resolution process.
  Also remove a leftover unused variable.
  

  • [DBH] configure

• ffmpeg doesn't seem to be working with multiple audio streams correctly

  21 juin 2017, par Caius Jard

  I’m having an issue with ffmpeg 3.2.2 ; ordinarily I ask it to make an MP4 video file with 2 audio streams. The command line looks like this :

  ffmpeg.exe
  
  -rtbufsize 256M 
  
  -f dshow -i video="screen-capture-recorder" -thread_queue_size 512 
  
  -f dshow -i audio="Line 2 (Virtual Audio Cable)" 
  
  -f dshow -i audio="Line 3 (Virtual Audio Cable)" 
  
  -map 0:v -map 1:a -map 2:a 
  
  -af silencedetect=n=-50dB:d=60 -pix_fmt yuv420p -y "c:\temp\2channelvideo.mp4"

  I’ve wrapped it for legibility. This once worked fine, but something is wrong lately - it doesnt seem to record any audio, even though I can use other tools like Audacity to record audio from these devices just fine

  I’m trying to do some diag on it by dropping the video component and asking ffmpeg to record the two audio devices to two separate files :

  ffmpeg.exe
  
  -f dshow -i audio="Line 2 (Virtual Audio Cable)" "c:\temp\line2.mp3" 
  
  -f dshow -i audio="Line 3 (Virtual Audio Cable)" "c:\temp\line3.mp3"

  ffmpeg’s console output looks like :

  Guessed Channel Layout for Input Stream #0.0 : stereo
  
  Input #0, dshow, from 'audio=Line 2 (Virtual Audio Cable)':
  
    Duration: N/A, start: 5935.810000, bitrate: 1411 kb/s
  
      Stream #0:0: Audio: pcm_s16le, 44100 Hz, stereo, s16, 1411 kb/s
  
  Guessed Channel Layout for Input Stream #1.0 : stereo
  
  Input #1, dshow, from 'audio=Line 3 (Virtual Audio Cable)':
  
    Duration: N/A, start: 5936.329000, bitrate: 1411 kb/s
  
      Stream #1:0: Audio: pcm_s16le, 44100 Hz, stereo, s16, 1411 kb/s
  
  Output #0, mp3, to 'c:\temp\line2.mp3':
  
    Metadata:
  
      TSSE            : Lavf57.56.100
  
      Stream #0:0: Audio: mp3 (libmp3lame), 44100 Hz, stereo, s16p
  
      Metadata:
  
        encoder         : Lavc57.64.101 libmp3lame
  
  Output #1, mp3, to 'c:\temp\line3.mp3':
  
    Metadata:
  
      TSSE            : Lavf57.56.100
  
      Stream #1:0: Audio: mp3 (libmp3lame), 44100 Hz, stereo, s16p
  
      Metadata:
  
        encoder         : Lavc57.64.101 libmp3lame
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (pcm_s16le (native) -> mp3 (libmp3lame))
  
    Stream #0:0 -> #1:0 (pcm_s16le (native) -> mp3 (libmp3lame))
  
  Press [q] to stop, [?] for help

  The problem i’m currently having is that the produced mp3 are identical copies of line 2 only ; line 3 audio is not recorded. The last line is of concern ; it seems to be saying that stream 0 is being mapped to both output 0 and 1 ? Do I need a map command for each file also ? I thought it would be implicit due to the way i specified the arguments

• Streaming audio + still image using ffmpeg

  21 juin 2017, par AEnimaH

  I’m streaming an audio source to azure media services using RTMP and a raspberry pi. This works great using this command :

  ffmpeg -f alsa -ac 1 -i hw:1,0 -c:a aac -b:a 128k -ar 44100 -f flv rtmp://...

  But know we want to add an image to this flv container because azure media player wants a video component.

  So I added video using this command :

  ffmpeg -loop 1 -i image.png -f alsa -ac 1 -i hw:1,0 -c:a aac -b:a 128k -ar 44100 -g 50 -pix_fmt yuv420p -f flv rtmp://...

  Yet it crashes with following log :

  ffmpeg version N-86429-gf8593c2 Copyright (c) 2000-2017 the FFmpeg developers
  
  built with gcc 4.9.2 (Raspbian 4.9.2-10)
  
  configuration: --prefix=/home/pi/ffmpeg/dependencies/output --enable-gpl --enable-libx264 --enable-libmp3lame --enable-nonfree --extra-cflags=-I/home/pi/ffmpeg/dependencies/output/include --extra-ldflags=-L/home/pi/ffmpeg/dependencies/output/lib --extra-libs='-lx264 -lpthread -lm -ldl'
  
  libavutil      55. 63.100 / 55. 63.100
  
  libavcodec     57. 98.100 / 57. 98.100
  
  libavformat    57. 73.100 / 57. 73.100
  
  libavdevice    57.  7.100 / 57.  7.100
  
  libavfilter     6. 91.100 /  6. 91.100
  
  libswscale      4.  7.101 /  4.  7.101
  
  libswresample   2.  8.100 /  2.  8.100
  
  libpostproc    54.  6.100 / 54.  6.100
  
  Input #0, png_pipe, from 'image.png':
  
  Duration: N/A, bitrate: N/A
  
      Stream #0:0: Video: png, rgba(pc), 600x400 [SAR 5669:5669 DAR 3:2], 25 fps, 25 tbr, 25 tbn, 25 tbc
  
  Guessed Channel Layout for Input Stream #1.0 : mono
  
  Input #1, alsa, from 'hw:1,0':
  
  Duration: N/A, start: 1497522851.947685, bitrate: 768 kb/s
  
      Stream #1:0: Audio: pcm_s16le, 48000 Hz, mono, s16, 768 kb/s
  
  Stream mapping:
  
  Stream #0:0 -> #0:0 (png (native) -> flv1 (flv))
  
  Stream #1:0 -> #0:1 (pcm_s16le (native) -> aac (native))
  
  Press [q] to stop, [?] for help
  
  [alsa @ 0x18e3330] Thread message queue blocking; consider raising the thread_queue_size option (current value: :sunglasses:
  
  Output #0, flv, to 'rtmp://aptus2-aptus.channel.mediaservices.windows.net:1935/live/b962f6df8d3b4e97a608981d019faaa4/default':
  
  Metadata:
  
      encoder         : Lavf57.73.100
  
      Stream #0:0: Video: flv1 (flv) ([2][0][0][0] / 0x0002), yuv420p(progressive), 600x400 [SAR 1:1 DAR 3:2], q=2-31, 200 kb/s, 25 fps, 1k tbn, 25 tbc
  
      Metadata:
  
      encoder         : Lavc57.98.100 flv
  
      Side data:
  
      cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: -1
  
      Stream #0:1: Audio: aac (LC) ([10][0][0][0] / 0x000A), 44100 Hz, mono, fltp, 128 kb/s
  
      Metadata:
  
      encoder         : Lavc57.98.100 aac
  
  frame=    3 fps=0.0 q=2.0 size=      56kB time=00:00:00.08 bitrate=5700.0kbits/sframe=   12 fps= 12 q=2.0 size=      66kB time=00:00:00.44 bitrate=1227.2kbits/sframe=   21 fps= 14 q=2.0 size=      72kB time=00:00:00.80 bitrate= 739.8kbits/sframe=   29 fps= 14 q=2.0 size=      79kB time=00:00:01.12 bitrate= 573.9kbits/s[alsa @ 0x18e3330] ALSA buffer xrun.
  
  frame=   39 fps= 15 q=2.0 size=      85kB time=00:00:02.81 bitrate= 246.9kbits/sframe=   50 fps= 16 q=2.0 size=      86kB time=00:00:02.81 bitrate= 251.4kbits/sframe=   60 fps= 17 q=2.0 size=     157kB time=00:00:02.81 bitrate= 457.1kbits/sframe=   71 fps= 17 q=2.0 size=     159kB time=00:00:02.81 bitrate= 462.2kbits/s[alsa @ 0x18e3330] ALSA buffer xrun.
  
  frame=   81 fps= 18 q=2.0 size=     161kB time=00:00:04.57 bitrate= 289.0kbits/sframe=   92 fps= 18 q=2.0 size=     163kB time=00:00:04.57 bitrate= 291.8kbits/sframe=  103 fps= 18 q=2.0 size=     234kB time=00:00:04.57 bitrate= 418.5kbits/sframe=  114 fps= 19 q=2.0 size=     235kB time=00:00:04.57 bitrate= 421.3kbits/s[alsa @ 0x18e3330] ALSA buffer xrun.
  
  frame=  124 fps= 19 q=2.0 size=     238kB time=00:00:06.66 bitrate= 292.8kbits/sframe=  135 fps= 19 q=2.0 size=     240kB time=00:00:06.66 bitrate= 294.7kbits/sframe=  146 fps= 19 q=2.0 size=     241kB time=00:00:06.66 bitrate= 296.6kbits/sav_interleaved_write_frame(): Broken pipe
  
  [flv @ 0x18f9ea0] Failed to update header with correct duration.
  
  [flv @ 0x18f9ea0] Failed to update header with correct filesize.
  
  Error writing trailer of rtmp://aptus2-aptus.channel.mediaservices.windows.net:1935/live/b962f6df8d3b4e97a608981d019faaa4/default: Broken pipe
  
  frame=  151 fps= 15 q=1.6 Lsize=     306kB time=00:00:06.70 bitrate= 373.5kbits/s speed=0.644x    
  
  video:284kB audio:24kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
  
  [aac @ 0x18fe6e0] Qavg: 3428.370
  
  Conversion failed!

  what am I doing wrong ? Any help would be awesome !