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• Why DASH video fragments are not reproducible nor readable with ffmpeg ?

  21 mai 2020, par salgarji

  I'm streaming live video using DASH through FFmpeg. Everything's OK, fragments are generated, and the mpd file, but I wanted to have reproducible independent fragments. Video players won't open those fragments. I guess it's because they are mpd file dependant. My question would be : can those fragments be generated in a way that they are reproducible ? I don't know if it has something to do to the frames I P B or just the way dash cuts video information, in a way that it only saves 'timeline' on the mpd...

  



  My purpose is not only being able to reproduce them sepparately, but I need to insert information in a metadata tag of the video, and ffmpeg won't let me read those live streaming generated fragments.

  



  FFmpeg input information command will behave like this :

  



  input :

  



  ffmpeg -i /path/video0-0-1.mp4


  



  output :

  



  ffmpeg version N-97777-g3b5a36c56d Copyright (c) 2000-2020 the FFmpeg developers
  built with Apple clang version 11.0.3 (clang-1103.0.32.59)
  configuration: --enable-gpl --enable-libx264
  libavutil      56. 45.100 / 56. 45.100
  libavcodec     58. 84.100 / 58. 84.100
  libavformat    58. 43.100 / 58. 43.100
  libavdevice    58.  9.103 / 58.  9.103
  libavfilter     7. 81.100 /  7. 81.100
  libswscale      5.  6.101 /  5.  6.101
  libswresample   3.  6.100 /  3.  6.100
  libpostproc    55.  6.100 / 55.  6.100
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fb324009400] could not find corresponding track id 1
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fb324009400] could not find corresponding trex (id 1)
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fb324009400] could not find corresponding track id 0
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fb324009400] trun track id unknown, no tfhd was found
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fb324009400] error reading header
/path/video0-0-1.mp4: Invalid data found when processing input


  



  I execute this FFmpeg code using fluent-ffmpeg over JS to generate the fragments :

  



  var ffmpeg = require('fluent-ffmpeg');

var grabacion = new ffmpeg();

grabacion.addInput('0')
.inputOptions(['-y -nostdin', '-f avfoundation', '-video_size 1280x720', '-pix_fmt nv12', '-framerate 30'])
.outputOptions(['-vcodec libx264', '-keyint_min 0', '-g 100', '-map 0:v', '-b:v 1000k', '-f dash',
 '-use_template 1', '-use_timeline 0', '-init_seg_name video0-$RepresentationID$-$Number$.mp4',
 '-media_seg_name video0-$RepresentationID$-$Number$.mp4', '-remove_at_exit 0', '-window_size 20', '-seg_duration 4'])
.output('/path/path/path/video.mpd')
.run();


  



  So, the final purpose would be to be able to insert a tag like this :

  



  ffmpeg -i video0-0-0.mp4 -movflags use_metadata_tags -metadata sample_tag=whateveryouwanttoadd video0-0-0-tagged.mp4


  



  Is there any way to do it ? Thank you in advance !

  


• FFMpeg ; Error when mixing two audio stream

  27 février 2021, par Ali Esmailpor

  I'm recording two stream by ffmpeg with this command :

  


  ffmpeg -protocol_whitelist pipe,udp,rtp -fflags +genpts -f sdp -i pipe:0 \
-map 0:v:0 -c:v copy \
-filter_complex \
"[0:a:0]volume=0.5[a0]; \
 [0:a:1]volume=0.5[a1]; \
 [a0][a1]amerge=inputs=2,pan=stereo|c0code>

  


  that [0:v:0] is my video stream and [0:a:0] and [0:a:1] are my audio streams that I want to mix them up and record it associate with video stream.

  


  But unfortunately, I get this ugly error sometimes that it causes silence in final video. I mean, when I get this error my final video becomes silence.

  


  


  LBRR frames is not implemented. Update your FFmpeg version to the
newest one from Git. If the problem still occurs, it means that your
file has a feature which has not been implemented.

  


  Error decoding a SILK frame.

  


  Error decoding an Opus frame.

  


  


  My ffmpeg version is :

  


  ffmpeg version 3.4.8-0ubuntu0.2 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 7 (Ubuntu 7.5.0-3ubuntu1~18.04)
  configuration: --prefix=/usr --extra-version=0ubuntu0.2 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --disable-stripping --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-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --enable-librsvg --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-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --enable-shared
  libavutil      55. 78.100 / 55. 78.100
  libavcodec     57.107.100 / 57.107.100
  libavformat    57. 83.100 / 57. 83.100
  libavdevice    57. 10.100 / 57. 10.100
  libavfilter     6.107.100 /  6.107.100
  libavresample   3.  7.  0 /  3.  7.  0
  libswscale      4.  8.100 /  4.  8.100
  libswresample   2.  9.100 /  2.  9.100
  libpostproc    54.  7.100 / 54.  7.100


  


  Where am I wrong ?

  


• Cannot play mp4 video with ffplay, but mpv can

  4 septembre 2021, par guapi

  I want to play a mp4 video on Debian 9.

  


  First, I try to use ffplay to play the video. I use the command ffplay test.mp4, but it cannot play, and display many same errors Receive_frame and send_packet both returned EAGAIN, which is an API violation.. There are detailed logs.

  


  $ffplay test.mp4
ffplay version n3.4.1-1-g84bbe2b650-1 Copyright (c) 2003-2017 the FFmpeg developers
  built with gcc 6.3.0 (Debian 6.3.0-18) 20170516
  configuration: --prefix=/usr --extra-version=1 --toolchain=hardened --libdir=/usr/lib/aarch64-linux-gnu --incdir=/usr/include/aarch64-linux-gnu --enable-gpl --disable-stripping --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-libmp3lame --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --enable-librsvg --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-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-version3 --enable-rkmpp --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --cross-prefix=aarch64-linux-gnu- --arch=arm64 --target-os=linux --enable-shared
  libavutil      55. 78.100 / 55. 78.100
  libavcodec     57.107.100 / 57.107.100
  libavformat    57. 83.100 / 57. 83.100
  libavdevice    57. 10.100 / 57. 10.100
  libavfilter     6.107.100 /  6.107.100
  libavresample   3.  7.  0 /  3.  7.  0
  libswscale      4.  8.100 /  4.  8.100
  libswresample   2.  9.100 /  2.  9.100
  libpostproc    54.  7.100 / 54.  7.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'test.mp4':q=    0B f=0/0   
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    artist          : 陈奕迅
    comment         : 163 key(Don't modify):clknHbeu87C/TSIpwWw5+/XVNX46iNc6ZUUI/NNBEnGJkB4J9X28bm/OzW54+zpI0NB1+t6V7QGaqmB68bMFun4XNP4wNmDOIp4WWeRm39qy/b0byW/uCuwv/MCWns8cctlzaCGCgZ1BwPvgwiafBMYcHpKHd1o0LSoaK+04tV2kClpKQTalNso32/6iLaRha+HEQqp6uyHtqsB8zoqnbIwint4Dni3AwFID6Y4aN
    title           : 梦想天空分外蓝
    encoder         : Lavf57.71.100
  Duration: 00:03:20.45, start: 0.000000, bitrate: 834 kb/s
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 854x480 [SAR 1:1 DAR 427:240], 700 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 127 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
mpi: mpp version: 073ceeb author: Jacob Chen DEBIAN: update rules for release_20171218
mpp_log: can not found match soc name: rockchip,rp px30 linux rockchip,px30 
hal_h264d_api: hal_h264d_init mpp_buffer_group_get_internal used ion In
mpp_rt: NOT found ion allocator
mpp_rt: found drm allocator
[h264_rkmpp @ 0x7f7003a000] Decoder noticed an info change (854x480), format=0
[h264_rkmpp @ 0x7f7003a000] Receive_frame and send_packet both returned EAGAIN, which is an API violation.
[h264_rkmpp @ 0x7f7003a000] Receive_frame and send_packet both returned EAGAIN, which is an API violation.
[h264_rkmpp @ 0x7f7003a000] Receive_frame and send_packet both returned EAGAIN, which is an API violation.
[h264_rkmpp @ 0x7f7003a000] Receive_frame and send_packet both returned EAGAIN, which is an API violation.
[h264_rkmpp @ 0x7f7003a000] Receive_frame and send_packet both returned EAGAIN, which is an API violation.
[h264_rkmpp @ 0x7f7003a000] Receive_frame and send_packet both returned EAGAIN, which is an API violation.
[h264_rkmpp @ 0x7f7003a000] Receive_frame and send_packet both returned EAGAIN, which is an API violation.



  


  Then, I try to use mpv to play the video. I use the command mpv test.mp4, and it successfully play the video. There are detailed logs.

  


  $mpv test.mp4
Playing: test.mp4
 (+) Video --vid=1 (*) (h264 854x480 25.000fps)
 (+) Audio --aid=1 --alang=und (*) (aac 2ch 44100Hz)
File tags:
 Artist: 陈奕迅
 Comment: 163 key(Don't modify):clknHbeu87C/TSIpwWw5+/XVNX46iNc6ZUUI/NNBEnGJkB4J9X28bm/OzW54+zpI0NB1+t6V7QGaqmB68bMFun4XNP4wNmDOIp4WWeRm39qy/b0byW/uCuwv/MCWns8cctlzaCGCgZ1BwPvgwiafBMYcHpKHd1o0LSoaK+04tV2kClpKQTalNso32/6iLaRha+HEQqp6uyHtqsB8zoqnbIwint4Dni3AwFID6Y4aNZYwtXYGiF6L7DDWSezw0ICX
 Title: 梦想天空分外蓝
ERROR: The DDK is not compatible with any of the Mali GPUs on the system.
The DDK was built for 0x860 r2p0 status range [0..15], but none of the GPUs matched:
/dev/mali0 detected as 0x7093 r0p0 status 0
[vo/x11] Warning: this legacy VO has bad performance. Consider fixing your graphics drivers, or not forcing the x11 VO.
AO: [alsa] 44100Hz stereo 2ch float
VO: [x11] 854x480 yuv420p
[ffmpeg] swscaler: No accelerated colorspace conversion found from yuv420p to bgra.
[ffmpeg] swscaler: No accelerated colorspace conversion found from yuv420p to bgra.
[ffmpeg] swscaler: No accelerated colorspace conversion found from yuv420p to bgra.
AV: 00:00:03 / 00:03:20 (1%) A-V:  0.000



  


  I don’t know much about video encoding and decoding. Both mpv and ffplay use ffmpeg for video decoding, but why are the results different ?
Thanks in advance.

  


  There is the information of my system.

  


  $uname -a
Linux linaro-alip 4.4.189 #24 SMP Tue Jul 21 17:01:59 CST 2020 aarch64 GNU/Linux


  


  $cat /proc/version
Linux version 4.4.189 (rpdzkj@rpdzkj) (gcc version 6.3.1 20170404 (Linaro GCC 6.3-2017.05) ) #24 SMP Tue Jul 21 17:01:59 CST 2020


  


  $lsb_release -a
No LSB modules are available.
Distributor ID: Debian
Description:    Debian GNU/Linux 9.13 (stretch)
Release:    9.13
Codename:   stretch