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• Pushing data to web-browser while processing input from ffmpeg

  6 septembre 2013, par Stacked

  I want to push output of this directly to the user using PHP/Python :

  wget -qO- "http://my-video-stream-input.url/here" | ffmpeg -i pipe:0 -ab 192000 -acodec libmp3lame -map_metadata -1 -vn 1378457645_myfile.mp3

  The above command takes the input stream and converts on-the-fly it to audio without waiting for full-file to download, this works perfectly at terminal. Now, I need to push the ffmpeg processed output audio to the web-browser, once again on-the-fly without completing the full transcode, like :

  Wget->ffmpeg->Web-browser in real-time

  I tried the below in PHP but this results in 0 byte file-downloads :

  $cmd = "wget -qO- "http://my-video-stream-input.url/here" | ffmpeg -i pipe:0 -ab 192000 -acodec libmp3lame -map_metadata -1 -vn 1378457645_myfile.mp3";
  
  header('Content-type: audio/mpeg');
  
  header("Content-Type: application/octet-stream");
  
  header("Content-Disposition: attachment; filename=\"1378457645_myfile.mp3\"");
  
  passthru($cmd);

  Adding 2>&1 to the $cmd shows downloads a 3.6 KB file with following

    ffmpeg version 0.7.15, Copyright (c) 2000-2013 the FFmpeg developers
  
    built on Feb 22 2013 07:22:31 with gcc 4.4.5
  
    configuration: --enable-libdc1394 --prefix=/usr --extra-cflags='-Wall -g ' --cc='ccache cc' --enable-shared --enable-libmp3lame --enable-gpl --enable-libvorbis --enable-pthreads --enable-libfaac --enable-libxvid --enable-postproc --enable-x11grab --enable-libgsm --enable-libtheora --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libx264 --enable-libspeex --enable-nonfree --disable-stripping --enable-avfilter --enable-libdirac --disable-decoder=libdirac --enable-libfreetype --enable-libschroedinger --disable-encoder=libschroedinger --enable-version3 --enable-libopenjpeg --enable-libvpx --enable-librtmp --extra-libs=-lgcrypt --disable-altivec --disable-armv5te --disable-armv6 --disable-vis
  
    libavutil    50. 43. 0 / 50. 43. 0
  
    libavcodec   52.123. 0 / 52.123. 0
  
    libavformat  52.111. 0 / 52.111. 0
  
    libavdevice  52.  5. 0 / 52.  5. 0
  
    libavfilter   1. 80. 0 /  1. 80. 0
  
    libswscale    0. 14. 1 /  0. 14. 1
  
    libpostproc  51.  2. 0 / 51.  2. 0
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'pipe:0':
  
    Duration: 00:02:54.75, start: 164.745578, bitrate: N/A
  
      Stream #0.0(und): Audio: aac, 44100 Hz, stereo, s16
  
      Metadata:
  
        creation_time   : 2013-08-30 05:36:13
  
  Output #0, mp3, to '1378458744_myfile.mp3':
  
    Metadata:
  
      TSSE            : Lavf52.111.0
  
      Stream #0.0(und): Audio: libmp3lame, 44100 Hz, stereo, s16, 192 kb/s
  
      Metadata:
  
        creation_time   : 2013-08-30 05:36:13
  
  Stream mapping:
  
    Stream #0.0 -> #0.0
  
  size=     134kB time=00:00:05.69 bitrate= 192.3kbits/s    
  
  size=     263kB time=00:00:11.23 bitrate= 192.1kbits/s    
  
  size=     386kB time=00:00:16.45 bitrate= 192.1kbits/s    
  
  size=     515kB time=00:00:21.96 bitrate= 192.1kbits/s    
  
  size=     637kB time=00:00:27.16 bitrate= 192.1kbits/s    
  
  size=     765kB time=00:00:32.62 bitrate= 192.0kbits/s    
  
  size=     884kB time=00:00:37.69 bitrate= 192.0kbits/s    
  
  size=    1011kB time=00:00:43.12 bitrate= 192.0kbits/s    
  
  size=    1134kB time=00:00:48.37 bitrate= 192.0kbits/s    
  
  size=    1253kB time=00:00:53.47 bitrate= 192.0kbits/s    
  
  size=    1379kB time=00:00:58.82 bitrate= 192.0kbits/s    
  
  size=    1508kB time=00:01:04.31 bitrate= 192.0kbits/s    
  
  size=    1632kB time=00:01:09.64 bitrate= 192.0kbits/s    
  
  size=    1758kB time=00:01:14.99 bitrate= 192.0kbits/s    
  
  size=    1883kB time=00:01:20.35 bitrate= 192.0kbits/s    
  
  size=    2010kB time=00:01:25.76 bitrate= 192.0kbits/s    
  
  size=    2141kB time=00:01:31.35 bitrate= 192.0kbits/s    
  
  size=    2265kB time=00:01:36.65 bitrate= 192.0kbits/s    
  
  size=    2389kB time=00:01:41.92 bitrate= 192.0kbits/s    
  
  size=    2515kB time=00:01:47.31 bitrate= 192.0kbits/s    
  
  size=    2637kB time=00:01:52.50 bitrate= 192.0kbits/s    
  
  size=    2767kB time=00:01:58.04 bitrate= 192.0kbits/s    
  
  size=    2888kB time=00:02:03.21 bitrate= 192.0kbits/s    
  
  size=    3017kB time=00:02:08.70 bitrate= 192.0kbits/s    
  
  size=    3142kB time=00:02:14.06 bitrate= 192.0kbits/s    
  
  size=    3266kB time=00:02:19.33 bitrate= 192.0kbits/s    
  
  size=    3391kB time=00:02:24.66 bitrate= 192.0kbits/s    
  
  size=    3518kB time=00:02:30.07 bitrate= 192.0kbits/s    
  
  size=    3650kB time=00:02:35.71 bitrate= 192.0kbits/s    
  
  size=    3778kB time=00:02:41.20 bitrate= 192.0kbits/s    
  
  size=    3862kB time=00:02:44.78 bitrate= 192.0kbits/s    
  
  video:0kB audio:3862kB global headers:0kB muxing overhead 0.004804%

• x264 on Ubuntu video bad/corrupted

  6 septembre 2013, par Ryzone

  I am trying to use command line x264 to produce a blu-ray compatible file for use in Adobe Encore. For the source file I've tried both ProRes and mpeg2, both 1080p24. Both files import into Encore fine (no transcoding needed which is great) but the ProRes version is pink and grey "static" and the mpeg2 is just a bunch of green/black lines. The exact same files and the exact same commands on my Win7 PC come out fine. I'm only doing a 10 sec sample of the complete 90min movie. I'd love for it to work on Ubuntu cause it is running a new i7 haswell that encodes much quicker than my PC (many hours difference in encoding time)

  Ubuntu 13.04
  
  
  
  x264 0.135.2 f0c1c53<br />
  
  built on Jul 24 2013, gcc: 4.7.3<br />
  
  configuration: --bit-depth=8 --chroma-format=all<br />
  
  x264 license: GPL version 2 or later
  
  
  
  command:
  
      x264 --bitrate 30000 --preset veryslow --tune film --bluray-compat --fps 24000/1001 --force-cfr --bframes 3 --ref 4 --muxer raw --no-weightb --weightp 0 --b-pyramid none --vbv-maxrate 40000 --vbv-bufsize 30000 --level 4.1 --profile high --keyint 24 --min-keyint 1 --open-gop --slices 4 --colorprim "bt709" --transfer "bt709" --colormatrix "bt709" --sar 1:1  -o output.264 --input-res 1920x1080 sample.mov

  (if it would work I'd be doing two pass encoding)

  I am able to encode the sample file with ffmpeg to h264 (if that helps).

• Can you put the result of a blackdetect filter in a textfile using ffmpeg ?

  9 mars 2017, par Gijserman

  I’m testing out the "blackdetect" filter in ffmpeg. I want to have the times when the video is black to be read by a script (like actionscript or javascript). I tried :

  ffmpeg -i video1.mp4 -vf "blackdetect=d=2:pix_th=0.00" -an -f null -

  And I get a nice result in the ffmpeg log :

  ffmpeg version N-55644-g68b63a3 Copyright (c) 2000-2013 the FFmpeg developers
  
    built on Aug 19 2013 20:32:00 with gcc 4.7.3 (GCC)
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-av
  
  isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab
  
  le-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetyp
  
  e --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --ena
  
  ble-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-l
  
  ibopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libsp
  
  eex --enable-libtheora --enable-libtwolame --enable-libvo-aacenc --enable-libvo-
  
  amrwbenc --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --
  
  enable-libxvid --enable-zlib
  
    libavutil      52. 42.100 / 52. 42.100
  
    libavcodec     55. 28.100 / 55. 28.100
  
    libavformat    55. 13.103 / 55. 13.103
  
    libavdevice    55.  3.100 / 55.  3.100
  
    libavfilter     3. 82.100 /  3. 82.100
  
    libswscale      2.  5.100 /  2.  5.100
  
    libswresample   0. 17.103 /  0. 17.103
  
    libpostproc    52.  3.100 / 52.  3.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'video1.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      creation_time   : 1970-01-01 00:00:00
  
      encoder         : Lavf53.13.0
  
    Duration: 00:02:01.54, start: 0.000000, bitrate: 275 kb/s
  
      Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 768x432 [
  
  SAR 1:1 DAR 16:9], 211 kb/s, 25 fps, 25 tbr, 25 tbn, 50 tbc
  
      Metadata:
  
        creation_time   : 1970-01-01 00:00:00
  
        handler_name    : VideoHandler
  
      Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 59
  
   kb/s
  
      Metadata:
  
        creation_time   : 1970-01-01 00:00:00
  
        handler_name    : SoundHandler
  
  Output #0, null, to 'pipe:':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf55.13.103
  
      Stream #0:0(eng): Video: rawvideo (I420 / 0x30323449), yuv420p, 768x432 [SAR
  
   1:1 DAR 16:9], q=2-31, 200 kb/s, 90k tbn, 25 tbc
  
      Metadata:
  
        creation_time   : 1970-01-01 00:00:00
  
        handler_name    : VideoHandler
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (h264 -> rawvideo)
  
  Press [q] to stop, [?] for help
  
  [null @ 00000000003279a0] Encoder did not produce proper pts, making some up.
  
  [blackdetect @ 0000000004d5e800] black_start:0 black_end:17.08 black_duration:17
  
  .08
  
  [blackdetect @ 0000000004d5e800] black_start:62.32 black_end:121.48 black_durati
  
  on:59.16
  
  frame= 3038 fps=2317 q=0.0 Lsize=N/A time=00:02:01.52 bitrate=N/A
  
  video:285kB audio:0kB subtitle:0 global headers:0kB muxing overhead -100.007543%

  And I’m particularly interested in this part :

  [blackdetect @ 0000000004e2e340] black_start:0 black_end:17.08 black_duration:17.08
  
  [blackdetect @ 0000000004e2e340] black_start:62.32 black_end:121.48 black_duration:59.16

  So my question :

  1. Is there a way to only take the blackdetect filter output and put it in a .txt file ?
  2. And if this is possible, is there a way to do this in a statement with multiple video inputs ? Like in this example

  ---

  example :

  ffmpeg -f concat -i mylist.txt -c copy concat.mp4

  Where mylist.txt is a list of videos :

  file 'video1.mp4'
  
  file 'video2.mp4'
  
  file 'video3.mp4'
  
  file 'video4.mp4'

  ---

  Basically what I want to have is one or more text files containing information about the black frames in every video in this list to be used by another program