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    The vocabulary used on this site and around MediaSPIP in general, aims to avoid reference to Web 2.0 and the companies that profit from media-sharing.
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    31 mai 2013, par

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  • streaming data with ffmpeg using pipe - freeze after few seconds

    13 octobre 2022, par tamirg

    Im fetching some video data, and trying to stream it using ffmpeg.
what i do is create an ffmpeg process, set it to get info from '-', and then when i fetch the video data i write it to the process STDIN.

    


    My problem is that its working, but only working for around 3 seconds, then the stream stops, and there are no longer any logs from ffmpeg.

    


    Im running ffmpeg with log level debug, and it seems to parse the data ok, which i guess thats why it works for 3 seconds, but then the ffmpeg stops printing any more logs.

    


    I dont want to attach all the logs because its too much, but ill write the main parts.
Maybe the ffmpeg process is missing some arguments ?

    


    It starts with :

    


    Clipping frame in rate conversion by 0.000008
2022-10-13T09:16:53.535546194Z cur_dts is invalid (this is harmless if it occurs once at the start per stream)
2022-10-13T09:16:53.535987546Z     Last message repeated 2 times
2022-10-13T09:16:53.536012520Z [hevc @ 0x55f4e8798100] nal_unit_type: 1(TRAIL_R), nuh_layer_id: 0, temporal_id: 0
2022-10-13T09:16:53.537017901Z [hevc @ 0x55f4e86eeb80] Decoded frame with POC 0.
2022-10-13T09:16:53.538652961Z [hevc @ 0x55f4e8798100] Output frame with POC 8.
2022-10-13T09:16:53.538782714Z [hevc @ 0x55f4e8789c00] Decoded frame with POC 1.
2022-10-13T09:16:53.540362322Z [hevc @ 0x55f4e8773500] Decoded frame with POC 2.
2022-10-13T09:16:53.540989229Z cur_dts is invalid (this is harmless if it occurs once at the start per stream)
2022-10-13T09:16:53.541118680Z     Last message repeated 1 times
2022-10-13T09:16:53.541161109Z [hevc @ 0x55f4e86eeb80] nal_unit_type: 1(TRAIL_R), nuh_layer_id: 0, temporal_id: 0
2022-10-13T09:16:53.542663730Z [hevc @ 0x55f4e86eeb80] Output frame with POC 9.
2022-10-13T09:16:53.544954074Z [hevc @ 0x55f4e8783e80] Decoded frame with POC 3.
2022-10-13T09:16:53.545102776Z cur_dts is invalid (this is harmless if it occurs once at the start per stream)
2022-10-13T09:16:53.545165406Z     Last message repeated 2 times
2022-10-13T09:16:53.545175969Z [hevc @ 0x55f4e8789c00] nal_unit_type: 1(TRAIL_R), nuh_layer_id: 0, temporal_id: 0
2022-10-13T09:16:53.546742754Z [hevc @ 0x55f4e8789c00] Output frame with POC 10.
2022-10-13T09:16:53.547695241Z [hevc @ 0x55f4e8877c40] Decoded frame with POC 4.
2022-10-13T09:16:53.549347290Z cur_dts is invalid (this is harmless if it occurs once at the start per stream)


    


    then :

    


    2022-10-13T09:16:53.828180084Z cur_dts is invalid (this is harmless if it occurs once at the start per stream)

2022-10-13T09:16:53.831843061Z     Last message repeated 2 times
2022-10-13T09:16:53.831902903Z [hevc @ 0x55f4e88984c0] nal_unit_type: 32(VPS), nuh_layer_id: 0, temporal_id: 0
2022-10-13T09:16:53.831909160Z [hevc @ 0x55f4e88984c0] nal_unit_type: 33(SPS), nuh_layer_id: 0, temporal_id: 0
2022-10-13T09:16:53.831912827Z [hevc @ 0x55f4e88984c0] nal_unit_type: 34(PPS), nuh_layer_id: 0, temporal_id: 0
2022-10-13T09:16:53.832173968Z [hevc @ 0x55f4e88984c0] nal_unit_type: 19(IDR_W_RADL), nuh_layer_id: 0, temporal_id: 0
2022-10-13T09:16:53.832309139Z [hevc @ 0x55f4e88984c0] Decoding VPS
2022-10-13T09:16:53.832324955Z [hevc @ 0x55f4e88984c0] Main profile bitstream
2022-10-13T09:16:53.832651015Z [hevc @ 0x55f4e88984c0] Decoding SPS
2022-10-13T09:16:53.832730623Z [hevc @ 0x55f4e88984c0] Main profile bitstream
2022-10-13T09:16:53.832785521Z [hevc @ 0x55f4e88984c0] Decoding VUI
2022-10-13T09:16:53.832833202Z [hevc @ 0x55f4e88984c0] Decoding PPS
2022-10-13T09:16:53.833112865Z [hevc @ 0x55f4e88984c0] Output frame with POC 0.
2022-10-13T09:16:53.835713007Z [hevc @ 0x55f4e8888080] Decoded frame with POC 59.
2022-10-13T09:16:53.836572581Z [libx264 @ 0x55f4e8794800] frame=   0 QP=44.23 NAL=3 Slice:I Poc:0   I:14400 P:0    SKIP:0    size=41597 bytes
2022-10-13T09:16:53.836783822Z [rtp @ 0x55f4eaa75fc0] Sending NAL 7 of len 24 M=0
2022-10-13T09:16:53.836805582Z [rtp @ 0x55f4eaa75fc0] Sending NAL 8 of len 4 M=0
2022-10-13T09:16:53.836809885Z [rtp @ 0x55f4eaa75fc0] Sending NAL 6 of len 642 M=0
2022-10-13T09:16:53.836830503Z [rtp @ 0x55f4eaa75fc0] Sending NAL 5 of len 40913 M=1
2022-10-13T09:16:53.836836082Z [rtp @ 0x55f4eaa75fc0] NAL size 40913 > 1460
2022-10-13T09:16:53.837084718Z [hevc @ 0x55f4e88a8900] nal_unit_type: 1(TRAIL_R), nuh_layer_id: 0, temporal_id: 0
2022-10-13T09:16:53.837193504Z [hevc @ 0x55f4e88a8900] Output frame with POC 1.
2022-10-13T09:16:53.844457060Z [libx264 @ 0x55f4e8794800] frame=   1 QP=48.02 NAL=2 Slice:P Poc:2   I:16   P:655  SKIP:13729 size=1459 bytes
2022-10-13T09:16:53.844621824Z [rtp @ 0x55f4eaa75fc0] Sending NAL 1 of len 1455 M=1
2022-10-13T09:16:53.844680058Z [hevc @ 0x55f4e8798100] nal_unit_type: 1(TRAIL_R), nuh_layer_id: 0, temporal_id: 0
2022-10-13T09:16:53.844749212Z [hevc @ 0x55f4e8798100] Output frame with POC 2.
2022-10-13T09:16:53.851913353Z [libx264 @ 0x55f4e8794800] frame=   2 QP=44.00 NAL=2 Slice:P Poc:4   I:0    P:11   SKIP:14389 size=48 bytes


    


    and finally the last logs are those, and afterwards i don't get anymore logs :

    


    2022-10-13T09:16:56.836957083Z [NULL @ 0x55f4e86e7a00] nal_unit_type: 1(TRAIL_R), nuh_layer_id: 0, temporal_id: 0
2022-10-13T09:16:56.837158270Z [hevc @ 0x55f4e8773500] nal_unit_type: 1(TRAIL_R), nuh_layer_id: 0, temporal_id: 0
2022-10-13T09:16:56.837355973Z [hevc @ 0x55f4e8773500] Output frame with POC 59.
2022-10-13T09:16:56.837935475Z [hevc @ 0x55f4e86eeb80] Decoded frame with POC 57.
2022-10-13T09:16:56.840799210Z [hevc @ 0x55f4e8789c00] Decoded frame with POC 58.
2022-10-13T09:16:56.842434529Z [libx264 @ 0x55f4e8794800] frame=  59 QP=33.00 NAL=2 Slice:P Poc:118 I:11   P:952  SKIP:13437 size=5251 bytes
2022-10-13T09:16:56.842472226Z [rtp @ 0x55f4eaa75fc0] Sending NAL 1 of len 5247 M=1
2022-10-13T09:16:56.842478464Z [rtp @ 0x55f4eaa75fc0] NAL size 5247 > 1460
2022-10-13T09:16:56.846625001Z [hevc @ 0x55f4e8773500] Decoded frame with POC 59.


    


  • Options to re-encode video with new key frames

    24 novembre 2022, par muraliv

    I need to add key frames at 2 second intervals in this video.

    


    ffprobe input-video.mp4 
ffprobe version 5.1.2 Copyright (c) 2007-2022 the FFmpeg developers
  built with Apple clang version 14.0.0 (clang-1400.0.29.102)
  configuration: --prefix=/usr/local/Cellar/ffmpeg/5.1.2 --enable-shared --enable-pthreads --enable-version3 --cc=clang --host-cflags= --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libdav1d --enable-libmp3lame --enable-libopus --enable-librav1e --enable-librist --enable-librubberband --enable-libsnappy --enable-libsrt --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libspeex --enable-libsoxr --enable-libzmq --enable-libzimg --disable-libjack --disable-indev=jack --enable-videotoolbox
  libavutil      57. 28.100 / 57. 28.100
  libavcodec     59. 37.100 / 59. 37.100
  libavformat    59. 27.100 / 59. 27.100
  libavdevice    59.  7.100 / 59.  7.100
  libavfilter     8. 44.100 /  8. 44.100
  libswscale      6.  7.100 /  6.  7.100
  libswresample   4.  7.100 /  4.  7.100
  libpostproc    56.  6.100 / 56.  6.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'input-video.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: mp42mp41
    creation_time   : 2022-11-23T10:04:47.000000Z
  Duration: 00:02:00.15, start: 0.000000, bitrate: 16302 kb/s
  Stream #0:0[0x1](eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(progressive), 1920x1080 [SAR 1:1 DAR 16:9], 16174 kb/s, 23.98 fps, 23.98 tbr, 24k tbn (default)
    Metadata:
      creation_time   : 2022-11-23T10:04:47.000000Z
      handler_name    : ?Mainconcept Video Media Handler
      vendor_id       : [0][0][0][0]
      encoder         : AVC Coding
  Stream #0:1[0x2](eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 125 kb/s (default)
    Metadata:
      creation_time   : 2022-11-23T10:04:47.000000Z
      handler_name    : #Mainconcept MP4 Sound Media Handler
      vendor_id       : [0][0][0][0]


    


    I used this ffmpeg command for this purpose.

    


    ffmpeg -i input-video.mp4 -codec:v libx264 -r 23.976 -force_key_frames "expr:gte(t,n_forced*2)" -c:a copy -y output.mp4


    


    However, this output.mp4 now has different video bitrate (3692 kb/s) compared to the original video (16302 kb/s). How do I use the ffmpeg command to re-encode the video with key frames and with the same bitrate as original video ?

    


  • How to cut video into 4M size mp4 video using ffmpeg

    13 octobre 2022, par fxsshiwo

    I have a *.mp4 video file, which is cut to a fixed size using ffmpeg, using the following commands

    


    '/usr/local/ffmpeg/bin/ffmpeg' '-y' '-ss' '00:00:00.00' '-i' '57066524-1.mp4' '-t' '00:00:05.00' '-vcodec' 'libx264' '-acodec' 'libmp3lame' '-b:v' '1000k' '-refs' '6' '-coder' '1' '-sc_threshold' '40' '-flags' '+loop' '-me_range' '16' '-subq' '7' '-i_qfactor' '0.71' '-qcomp' '0.6' '-qdiff' '4' '-trellis' '1' '-b:a' '128k' '-pass' '1' '-passlogfile' '/tmp/ffmpeg-passes6332bdc9814883qh89/pass-6332bdc98160c' '1.mp4'

    


    but I get an error saying -

    


    Unknown encoder 'libx264'

    


    Here is the complete error message：

    


    ffmpeg version 5.1 Copyright (c) 2000-2022 the FFmpeg developers
  built with gcc 4.8.5 (GCC) 20150623 (Red Hat 4.8.5-44)
  configuration: --enable-shared --enable-swscale --enable-gpl --enable-nonfree --enable-pic --prefix=/usr/local/ffmpeg --enable-version3 --enable-postproc --enable-pthreads --enable-static --enable-libx264
  libavutil      57. 28.100 / 57. 28.100
  libavcodec     59. 37.100 / 59. 37.100
  libavformat    59. 27.100 / 59. 27.100
  libavdevice    59.  7.100 / 59.  7.100
  libavfilter     8. 44.100 /  8. 44.100
  libswscale      6.  7.100 /  6.  7.100
  libswresample   4.  7.100 /  4.  7.100
  libpostproc    56.  6.100 / 56.  6.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '57066524-1.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: mp42mp41
    creation_time   : 2022-09-26T02:06:24.000000Z
  Duration: 00:00:26.11, start: 0.000000, bitrate: 6683 kb/s
  Stream #0:0[0x1](eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(progressive), 720x720 [SAR 1:1 DAR 1:1], 6367 kb/s, 25 fps, 25 tbr, 25k tbn (default)
    Metadata:
      creation_time   : 2022-09-26T02:06:24.000000Z
      handler_name    : ?Mainconcept Video Media Handler
      vendor_id       : [0][0][0][0]
      encoder         : AVC Coding
  Stream #0:1[0x2](eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 317 kb/s (default)
    Metadata:
      creation_time   : 2022-09-26T02:06:24.000000Z
      handler_name    : #Mainconcept MP4 Sound Media Handler
      vendor_id       : [0][0][0][0]
Unknown encoder 'libx264'



    


    I try to install libx264 and recompile, I still get this error

    


    [install libx264]
git clone https://code.videolan.org/videolan/x264.git
cd x264
./configure --prefix=/usr/local/x264/ --includedir=/usr/local/include --libdir=/usr/local/lib --enable-shared
./configure --prefix=/usr/softinstall/x264/ --includedir=/usr/local/include --libdir=/usr/local/lib --enable-shared

[compile ffmpeg]
wget http://www.ffmpeg.org/releases/ffmpeg-5.1.tar.gz
tar -zxvf ffmpeg-5.1.tar.gz
cd ffmpeg-5.1
./configure --enable-shared --enable-swscale --enable-gpl --enable-nonfree --enable-pic --prefix=/usr/local/ffmpeg --enable-version3 --enable-postproc --enable-pthreads --enable-static --enable-libx264 --enable-libmp3lame


    


    My questions :

    


      

    1. How to install ffmpeg with libx264

      2. 


    2. How to cut video into fixed size with ffmpeg

      3. 


    


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