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• compiling FFmpeg on AIX

  3 mars 2017, par epitaxial

  I’m a hardware guy that likes to play around with different architectures and operating systems. Anyhow I’m trying to compile FFmpeg on AIX 7.1 using gcc but having some issues. I grabbed the latest code from git and while it does compile with a few warnings FFmpeg does not work. From my limited understanding it looks like the code is using 64 bit integers but was compiled as 32 bit ? Maybe someone can shed some light on this. Here is what happens when executing FFmpeg

  ./ffmpeg -i rtsp://192.168.1.9:554 -an -c copy -t 1:00:00 test.mp4
  
  ffmpeg version 3.2.git Copyright (c) 2000-2017 the FFmpeg developers
  
  built with gcc 4.8.5 (GCC)
  
  configuration: --enable-nonfree
  
  libavutil      55. 47.100 / 55. 47.100
  
  libavcodec     57. 81.100 / 57. 81.100
  
  libavformat    57. 66.102 / 57. 66.102
  
  libavdevice    57.  2.100 / 57.  2.100
  
  libavfilter     6. 74.100 /  6. 74.100
  
  libswscale      4.  3.101 /  4.  3.101
  
  libswresample   2.  4.100 /  2.  4.100
  
  [NULL @ 20932ac0] Value 0.000000 for parameter 'avioflags' is not a valid    set of 32bit integer flags
  
  [NULL @ 20932ac0] Value 2097664.000000 for parameter 'fflags' is not a valid set of 32bit integer flags
  
  [NULL @ 20932ac0] Value 0.000000 for parameter 'fdebug' is not a valid set of 32bit integer flags
  
  [NULL @ 20932ac0] Value 1.000000 for parameter 'f_err_detect' is not a valid set of 32bit integer flags
  
  [NULL @ 20932ac0] Value 1.000000 for parameter 'err_detect' is not a valid set of 32bit integer flags
  
  [RTSP demuxer @ 20933220] Value 0.000000 for parameter 'rtpflags' is not a valid set of 32bit integer flags
  
  [RTSP demuxer @ 20933220] Value 0.000000 for parameter 'rtsp_transport' is not a valid set of 32bit integer flags
  
  [RTSP demuxer @ 20933220] Value 0.000000 for parameter 'rtsp_flags' is not a valid set of 32bit integer flags
  
  [RTSP demuxer @ 20933220] Value 15.000000 for parameter 'allowed_media_types' is not a valid set of 32bit integer flags
  
  [rtsp @ 20932ac0] Unable to open RTSP for listening
  
  rtsp://192.168.1.9:554: Can't assign requested address

  Is my reasoning correct ? Thanks.

• thread_queue_size during Live Streaming from ffmpeg

  11 mars 2017, par user2967920

  I’m trying to stream a webcam stream froma RaspberryPi-B to Youtube. The webcam used is a Logitech C920. If I use the h264 stream from the camera itself, it works fine using

  ffmpeg -f alsa -i hw:1,0 -f v4l2 -vcodec h264 -video_size 854x480 -r 25 -i /dev/video0 -acodec aac -b:a 64000 -ar 48000 -bufsize 64k -b:v 1200k -bufsize 1024k  -maxrate 1800k -vcodec copy -g 60 -r 30 -f flv
  
   rtmp://a.rtmp.youtube.com/live2/stream_here

  So, for this to work with other non h264 cameras like the Pi Cam or any other cheaper webcam, it needs to work with the raw stream and get converted to h264 using libx264. This is the whole point of using the Pi. Hence the second command set.

  ffmpeg -f alsa -ac 2 -i hw:1,0 -f v4l2 -i /dev/video0 -framerate 25 -video_size 1280x720  -c:v libx264 -preset veryfast -maxrate 1984k -bufsize 3968k -vf "format=yuv420p" -g 60 -c:a aac -b:a 128k -ar 44100 -f flv rtmp://a.rtmp.youtube.com/live2/stream_name

  So this results in the following issue.

  ffmpeg version git-2017-03-03-68ee800 Copyright (c) 2000-2017 the FFmpeg developers
  
    built with gcc 4.9.2 (Raspbian 4.9.2-10)
  
    configuration: --arch=armhf --target-os=linux --enable-gpl --enable-libx264 --enable-nonfree --extra-libs=-lasound --enable-pthreads
  
    libavutil      55. 47.101 / 55. 47.101
  
    libavcodec     57. 82.100 / 57. 82.100
  
    libavformat    57. 66.103 / 57. 66.103
  
    libavdevice    57.  3.100 / 57.  3.100
  
    libavfilter     6. 74.100 /  6. 74.100
  
    libswscale      4.  3.101 /  4.  3.101
  
    libswresample   2.  4.100 /  2.  4.100
  
    libpostproc    54.  2.100 / 54.  2.100
  
  Guessed Channel Layout for Input Stream #0.0 : stereo
  
  Input #0, alsa, from 'hw:1,0':
  
    Duration: N/A, start: 1488650966.446293, bitrate: 1024 kb/s
  
      Stream #0:0: Audio: pcm_s16le, 32000 Hz, stereo, s16, 1024 kb/s
  
  Input #1, video4linux2,v4l2, from '/dev/video0':
  
    Duration: N/A, start: 2227.042654, bitrate: 159252 kb/s
  
      Stream #1:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 864x480, 159252 kb/s, 24 fps, 24 tbr, 1000k tbn, 1000k tbc
  
  Stream mapping:
  
    Stream #1:0 -> #0:0 (rawvideo (native) -> h264 (libx264))
  
    Stream #0:0 -> #0:1 (pcm_s16le (native) -> aac (native))
  
  Press [q] to stop, [?] for help
  
  [video4linux2,v4l2 @ 0x2e42310] Thread message queue blocking; consider raising the thread_queue_size option (current value: 8)
  
  Illegal instruction
  
  pi@raspberrypi:~ $

  If I add

  thread_queue_size 512 

  I end up with

  pi@raspberrypi:~ $ ffmpeg -f alsa -ac 2 -i hw:1,0 -f v4l2 -thread_queue_size 512 -i /dev/video0 -framerate 25 -video_size 1280x720  -c:v libx264 -preset veryfast -maxrate 1984k -bufsize 3968k -vf "format=yuv420p" -g 60 -c:a aac -b:a 128k -ar 44100 -f flv rtmp://a.rtmp.youtube.com/live2/zqg7-98wy-60b6-f2yx
  
  ffmpeg version git-2017-03-03-68ee800 Copyright (c) 2000-2017 the FFmpeg developers
  
    built with gcc 4.9.2 (Raspbian 4.9.2-10)
  
    configuration: --arch=armhf --target-os=linux --enable-gpl --enable-libx264 --enable-nonfree --extra-libs=-lasound --enable-pthreads
  
    libavutil      55. 47.101 / 55. 47.101
  
    libavcodec     57. 82.100 / 57. 82.100
  
    libavformat    57. 66.103 / 57. 66.103
  
    libavdevice    57.  3.100 / 57.  3.100
  
    libavfilter     6. 74.100 /  6. 74.100
  
    libswscale      4.  3.101 /  4.  3.101
  
    libswresample   2.  4.100 /  2.  4.100
  
    libpostproc    54.  2.100 / 54.  2.100
  
  Guessed Channel Layout for Input Stream #0.0 : stereo
  
  Input #0, alsa, from 'hw:1,0':
  
    Duration: N/A, start: 1488651430.836193, bitrate: 1024 kb/s
  
      Stream #0:0: Audio: pcm_s16le, 32000 Hz, stereo, s16, 1024 kb/s
  
  Input #1, video4linux2,v4l2, from '/dev/video0':
  
    Duration: N/A, start: 2691.407641, bitrate: 159252 kb/s
  
      Stream #1:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 864x480, 159252 kb/s, 24 fps, 24 tbr, 1000k tbn, 1000k tbc
  
  Stream mapping:
  
    Stream #1:0 -> #0:0 (rawvideo (native) -> h264 (libx264))
  
    Stream #0:0 -> #0:1 (pcm_s16le (native) -> aac (native))
  
  Press [q] to stop, [?] for help
  
  Illegal instruction
  
  pi@raspberrypi:~ $

  Where exactly does

  thread_queue_size

  Belong ?

  Notes :
  ffmpeg was built using this reference
  –extra-libs=-lasound & —enable=pthreads was used

• FFMPEG input options in rust

  31 juillet 2020, par Paul_ghost

  I want to decode rtsp stream like that :ffplay -max_delay 50000 "rtsp://name:password@1.2.3.4:port". So I tried use this crate - https://crates.io/crates/ffmpeg-next , but I succeeded in only non-option receiving data with function input() .
Well, I don't understand how to use that option or other options.
Should I use other crate or something else ?