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• Centos : TERM enivornment Variable Not Set

  21 janvier 2014, par Architact

  I am working on a mobile application which allows users to upload videos, upon upload the videos are converted to mp4 format, I am using a shell script for that purpose, the script was working fine on our last server but we switched our server and now it has stopped working, the log files of apache are printing.

  [Tue Jan 21 00:57:37.003944 2014] [:error] TERM environment variable not set.
  
  [Tue Jan 21 00:57:37.148531 2014] [:error] ./script.sh: line 3: ffmpeg: command not found
  
  [Tue Jan 21 00:57:37.148794 2014] [:error] script.sh: line 4: ffmpeg: command not found

  The content of script.sh are

  #!/bin/bash -p
  
  clear
  
  ffmpeg -i $filename -strict experimental -ar 22050 converted.mp4<br />
  
  ffmpeg -itsoffset -1 -i  converted.mp4 -vframes 25 -filter:v scale="min(500\, iw):-1"  thumbnail.png

  I am calling the script form php using

  shell_exec("script.sh 52567afa374c61381399290.mp4");

  Any help would be greatly appreciated.

  Thanks

• How to make that video module can generate readable files for the module JW Player ?

  4 janvier 2015, par Dvex

  I use Drupal 7.x with Video Module, Video Pressets for FFMPEG and JW Player.
  I install FFMPEG with this Guide : https://trac.ffmpeg.org/wiki/CompilationGuide/Ubuntu in Ubuntu 14.04

  I’m using jQuery 1.8

  I downloaded the files that the JW Player module requires and renamed some files, as the guide tells me.

  I set the video module so you can use FFMPEG and established the necessary pressets (FLV, MP4 and WebM) for any browser (web and mobile).

  I changed the default settings of these pressets. I put check the option : Force one-pass Encoding. Because if not me error message :

  PHPVideoToolkit error: Execute error. It was not possible to encode "/var/www/html/sites/default/files/private/videos/original/reel para web en loop_2.mp4" as FFmpeg returned an error. Note, however the error was encountered on the second pass of the encoding process and the first pass appear to go fine. The error is with the video codec of the input file. FFmpeg reports the error to be "Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height".
  
  
  
  /usr/bin/ffmpeg -i '/var/www/html/sites/default/files/private/videos/original/reel para web en loop_2.mp4' -strict experimental -vcodec 'h264' -acodec 'aac' -vprofile 'baseline' -ac '2' -pass '1' -passlogfile '/tmp/1420389438-54a96c3eda9fc-multipass'  -y /tmp/1420389438-54a96c3eda8c1.mp4
  
  ffmpeg version 1.2.6-7:1.2.6-1~trusty1 Copyright (c) 2000-2014 the FFmpeg developers
  
    built on Apr 26 2014 18:52:58 with gcc 4.8 (Ubuntu 4.8.2-19ubuntu1)
  
    configuration: --arch=amd64 --disable-stripping --enable-avresample --enable-pthreads --enable-runtime-cpudetect --extra-version='7:1.2.6-1~trusty1' --libdir=/usr/lib/x86_64-linux-gnu --prefix=/usr --enable-bzlib --enable-libdc1394 --enable-libfreetype --enable-frei0r --enable-gnutls --enable-libgsm --enable-libmp3lame --enable-librtmp --enable-libopencv --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-vaapi --enable-vdpau --enable-libvorbis --enable-libvpx --enable-zlib --enable-gpl --enable-postproc --enable-libcdio --enable-x11grab --enable-libx264 --shlibdir=/usr/lib/x86_64-linux-gnu --enable-shared --disable-static
  
    libavutil      52. 18.100 / 52. 18.100
  
    libavcodec     54. 92.100 / 54. 92.100
  
    libavformat    54. 63.104 / 54. 63.104
  
    libavdevice    53.  5.103 / 53.  5.103
  
    libavfilter     3. 42.103 /  3. 42.103
  
    libswscale      2.  2.100 /  2.  2.100
  
    libswresample   0. 17.102 /  0. 17.102
  
    libpostproc    52.  2.100 / 52.  2.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/var/www/html/sites/default/files/private/videos/original/reel para web en loop_2.mp4':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 0
  
      compatible_brands: mp42mp41
  
      creation_time   : 2013-09-12 17:30:22
  
    Duration: 00:00:39.32, start: 0.000000, bitrate: 3190 kb/s
  
      Stream #0:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 720x480 [SAR 40:33 DAR 20:11], 2991 kb/s, 29.97 fps, 29.97 tbr, 29970 tbn, 59.94 tbc
  
      Metadata:
  
        creation_time   : 2013-09-12 17:30:22
  
        handler_name    : Mainconcept MP4 Video Media Handler
  
      Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 189 kb/s
  
      Metadata:
  
        creation_time   : 2013-09-12 17:30:22
  
        handler_name    : Mainconcept MP4 Sound Media Handler
  
  [libx264 @ 0x164dec0] using SAR=40/33
  
  [libx264 @ 0x164dec0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
  
  [libx264 @ 0x164dec0] profile Constrained Baseline, level 3.0
  
  [libx264 @ 0x164dec0] 264 - core 142 r2389 956c8d8 - H.264/MPEG-4 AVC codec - Copyleft 2003-2014 - http://www.videolan.org/x264.html - options: cabac=0 ref=1 deblock=1:0:0 analyse=0x1:0 me=dia subme=2 psy=1 psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=1 trellis=0 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=0 threads=6 lookahead_threads=2 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=0 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
  
  Output #0, mp4, to '/tmp/1420389438-54a96c3eda8c1.mp4':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 0
  
      compatible_brands: mp42mp41
  
      encoder         : Lavf54.63.104
  
      Stream #0:0(eng): Video: h264 ([33][0][0][0] / 0x0021), yuv420p, 720x480 [SAR 40:33 DAR 20:11], q=-1--1, pass 1, 11988 tbn, 29.97 tbc
  
      Metadata:
  
        creation_time   : 2013-09-12 17:30:22
  
        handler_name    : Mainconcept MP4 Video Media Handler
  
      Stream #0:1(eng): Audio: aac ([64][0][0][0] / 0x0040), 48000 Hz, stereo, fltp, 128 kb/s
  
      Metadata:
  
        creation_time   : 2013-09-12 17:30:22
  
        handler_name    : Mainconcept MP4 Sound Media Handler
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (h264 -> libx264)
  
    Stream #0:1 -> #0:1 (aac -> aac)
  
  Press [q] to stop, [?] for help
  
  frame=   88 fps=0.0 q=29.0 size=     483kB time=00:00:02.96 bitrate=1335.6kbits/s dup=1 drop=0    
  
  frame=  190 fps=189 q=29.0 size=    1916kB time=00:00:06.33 bitrate=2477.6kbits/s dup=1 drop=0    
  
  frame=  289 fps=192 q=29.0 size=    3001kB time=00:00:09.64 bitrate=2549.5kbits/s dup=1 drop=0    
  
  frame=  395 fps=196 q=29.0 size=    3732kB time=00:00:13.31 bitrate=2296.7kbits/s dup=1 drop=0    
  
  frame=  495 fps=197 q=29.0 size=    4481kB time=00:00:16.66 bitrate=2203.1kbits/s dup=1 drop=0    
  
  frame=  591 fps=196 q=29.0 size=    5152kB time=00:00:19.98 bitrate=2111.4kbits/s dup=1 drop=0    
  
  frame=  690 fps=196 q=29.0 size=    6329kB time=00:00:23.01 bitrate=2252.4kbits/s dup=1 drop=0    
  
  frame=  790 fps=197 q=29.0 size=    7184kB time=00:00:26.32 bitrate=2235.6kbits/s dup=1 drop=0    
  
  frame=  890 fps=197 q=29.0 size=    8532kB time=00:00:29.73 bitrate=2350.3kbits/s dup=1 drop=0    
  
  frame= 1000 fps=199 q=29.0 size=    9398kB time=00:00:33.42 bitrate=2303.0kbits/s dup=1 drop=0    
  
  frame= 1106 fps=200 q=29.0 size=   10423kB time=00:00:37.01 bitrate=2306.8kbits/s dup=1 drop=0    
  
  frame= 1178 fps=199 q=-1.0 Lsize=   11404kB time=00:00:39.31 bitrate=2376.1kbits/s dup=1 drop=0
  
  video:10752kB audio:618kB subtitle:0 global headers:0kB muxing overhead 0.302603%
  
  [libx264 @ 0x164dec0] frame I:87    Avg QP:24.23  size: 21823
  
  [libx264 @ 0x164dec0] frame P:1091  Avg QP:25.90  size:  8351
  
  [libx264 @ 0x164dec0] mb I  I16..4: 50.9%  0.0% 49.1%
  
  [libx264 @ 0x164dec0] mb P  I16..4: 14.8%  0.0%  0.0%  P16..4: 51.3%  0.0%  0.0%  0.0%  0.0%    skip:33.9%
  
  [libx264 @ 0x164dec0] coded y,uvDC,uvAC intra: 43.9% 38.7% 10.2% inter: 23.0% 14.4% 0.8%
  
  [libx264 @ 0x164dec0] i16 v,h,dc,p: 31% 39% 19% 11%
  
  [libx264 @ 0x164dec0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 18% 44% 14%  5%  4%  4%  4%  4%  4%
  
  [libx264 @ 0x164dec0] i8c dc,h,v,p: 57% 22% 17%  4%
  
  [libx264 @ 0x164dec0] kb/s:2240.77
  
  /usr/bin/ffmpeg -i '/var/www/html/sites/default/files/private/videos/original/reel para web en loop_2.mp4' -strict experimental -vcodec 'h264' -acodec 'aac' -vprofile 'baseline' -ac '2' -pass '2' -passlogfile '/tmp/1420389438-54a96c3eda9fc-multipass'  -y /tmp/1420389438-54a96c3eda8c1.mp4
  
  ffmpeg version 1.2.6-7:1.2.6-1~trusty1 Copyright (c) 2000-2014 the FFmpeg developers
  
    built on Apr 26 2014 18:52:58 with gcc 4.8 (Ubuntu 4.8.2-19ubuntu1)
  
    configuration: --arch=amd64 --disable-stripping --enable-avresample --enable-pthreads --enable-runtime-cpudetect --extra-version='7:1.2.6-1~trusty1' --libdir=/usr/lib/x86_64-linux-gnu --prefix=/usr --enable-bzlib --enable-libdc1394 --enable-libfreetype --enable-frei0r --enable-gnutls --enable-libgsm --enable-libmp3lame --enable-librtmp --enable-libopencv --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-vaapi --enable-vdpau --enable-libvorbis --enable-libvpx --enable-zlib --enable-gpl --enable-postproc --enable-libcdio --enable-x11grab --enable-libx264 --shlibdir=/usr/lib/x86_64-linux-gnu --enable-shared --disable-static
  
    libavutil      52. 18.100 / 52. 18.100
  
    libavcodec     54. 92.100 / 54. 92.100
  
    libavformat    54. 63.104 / 54. 63.104
  
    libavdevice    53.  5.103 / 53.  5.103
  
    libavfilter     3. 42.103 /  3. 42.103
  
    libswscale      2.  2.100 /  2.  2.100
  
    libswresample   0. 17.102 /  0. 17.102
  
    libpostproc    52.  2.100 / 52.  2.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/var/www/html/sites/default/files/private/videos/original/reel para web en loop_2.mp4':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 0
  
      compatible_brands: mp42mp41
  
      creation_time   : 2013-09-12 17:30:22
  
    Duration: 00:00:39.32, start: 0.000000, bitrate: 3190 kb/s
  
      Stream #0:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 720x480 [SAR 40:33 DAR 20:11], 2991 kb/s, 29.97 fps, 29.97 tbr, 29970 tbn, 59.94 tbc
  
      Metadata:
  
        creation_time   : 2013-09-12 17:30:22
  
        handler_name    : Mainconcept MP4 Video Media Handler
  
      Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 189 kb/s
  
      Metadata:
  
        creation_time   : 2013-09-12 17:30:22
  
        handler_name    : Mainconcept MP4 Sound Media Handler
  
  [libx264 @ 0x161eec0] using SAR=40/33
  
  [libx264 @ 0x161eec0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
  
  [libx264 @ 0x161eec0] constant rate-factor is incompatible with 2pass.
  
  Output #0, mp4, to '/tmp/1420389438-54a96c3eda8c1.mp4':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 0
  
      compatible_brands: mp42mp41
  
      Stream #0:0(eng): Video: h264, yuv420p, 720x480 [SAR 40:33 DAR 20:11], q=-1--1, pass 2, 90k tbn, 29.97 tbc
  
      Metadata:
  
        creation_time   : 2013-09-12 17:30:22
  
        handler_name    : Mainconcept MP4 Video Media Handler
  
      Stream #0:1(eng): Audio: none, 48000 Hz, stereo, fltp, 128 kb/s
  
      Metadata:
  
        creation_time   : 2013-09-12 17:30:22
  
        handler_name    : Mainconcept MP4 Sound Media Handler
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (h264 -> libx264)
  
    Stream #0:1 -> #0:1 (aac -> aac)
  
  Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height

  When I save a node and add its corresponding video, the module generates the 3 files with their respective formats. But when thrown at the JW Player module, only plays FLV in every browser.
  But not the MP4 or WebM.

  I checked the log and status report and all I get in order.

  So I assume that the MP4 and WebM formats generated are not what the JW Player waiting.

  Does anyone have the solution to this problem ? I tried to recompile FFMPEG with more codecs but it does not solve the problem.

  This is my FFMPEG Configuration :

  ffmpeg version 1.2.6-1~trusty1 Copyright (c) 2000-2014 the FFmpeg developers
  
    built on Apr 26 2014 18:52:58 with gcc 4.8 (Ubuntu 4.8.2-19ubuntu1)
  
    configuration: --arch=amd64 --disable-stripping --enable-avresample --enable-pthreads --enable-runtime-cpudetect --extra-version='7:1.2.6-1~trusty1' --libdir=/usr/lib/x86_64-linux-gnu --prefix=/usr --enable-bzlib --enable-libdc1394 --enable-libfreetype --enable-frei0r --enable-gnutls --enable-libgsm --enable-libmp3lame --enable-librtmp --enable-libopencv --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-vaapi --enable-vdpau --enable-libvorbis --enable-libvpx --enable-zlib --enable-gpl --enable-postproc --enable-libcdio --enable-x11grab --enable-libx264 --shlibdir=/usr/lib/x86_64-linux-gnu --enable-shared --disable-static

• ffmpeg determine correct codec to use

  6 janvier 2015, par nha

  I am trying to use .y4m files that I feed into Chrome for playing.
  This is the only format that I can use.

  I have a set of .y4m files that are working for my use case, taken from here.
  For example let’s say that I use the file mobile_qcif_7.5fps.y4m.

  I also have a .mp4 file (specifically the sample small.mp4 file from techslides ). I know how to convert small.mp4 to small.y4m with the following command :

  ffmpeg -y -i small.mp4 small.y4m

  I would like the resulting file to be accepted by Chrome, just like the other file.
  What options should I use (and how to find them) ?

  Additional information

  ffprobe gives :

  $ ffprobe small.y4m 
  
  avprobe version 0.8.13-6:0.8.13-0ubuntu0.13.10.1, Copyright (c) 2007-2014 the Libav developers
  
    built on Jul 15 2014 13:48:35 with gcc 4.8.1
  
  [yuv4mpegpipe @ 0x23160c0] Estimating duration from bitrate, this may be inaccurate
  
  Input #0, yuv4mpegpipe, from 'small.y4m':
  
    Duration: N/A, bitrate: N/A
  
      Stream #0.0: Video: rawvideo, yuv420p, 560x320, 30 fps, 30 tbr, 30 tbn, 30 tbc
  
  
  
  
  
  $ ffprobe mobile_qcif_7.5fps.y4m
  
  avprobe version 0.8.13-6:0.8.13-0ubuntu0.13.10.1, Copyright (c) 2007-2014 the Libav developers
  
    built on Jul 15 2014 13:48:35 with gcc 4.8.1
  
  [yuv4mpegpipe @ 0x1e080c0] max_analyze_duration reached
  
  [yuv4mpegpipe @ 0x1e080c0] Estimating duration from bitrate, this may be inaccurate
  
  Input #0, yuv4mpegpipe, from 'mobile_qcif_7.5fps.y4m':
  
    Duration: N/A, bitrate: N/A
  
      Stream #0.0: Video: rawvideo, yuv420p, 176x144, PAR 128:117 DAR 1408:1053, 7.50 fps, 7.50 tbr, 7.50 tbn, 7.50 tbc

  OS : I am using ffmpeg in Ubuntu 13.10 from the default repository : I ran sudo apt-get install ffmpeg libavcodec-extra-53

  Complete console output

  $ ffmpeg -y -i small.mp4 small.y4m
  
  ffmpeg version 0.8.13-6:0.8.13-0ubuntu0.13.10.1, Copyright (c) 2000-2014 the Libav developers
  
    built on Jul 15 2014 13:48:35 with gcc 4.8.1
  
  *** THIS PROGRAM IS DEPRECATED ***
  
  This program is only provided for compatibility and will be removed in a future release. Please use avconv instead.
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'small.mp4':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 0
  
      compatible_brands: mp42isomavc1
  
      creation_time   : 2010-03-20 21:29:11
  
      encoder         : HandBrake 0.9.4 2009112300
  
    Duration: 00:00:05.56, start: 0.000000, bitrate: 551 kb/s
  
      Stream #0.0(und): Video: h264 (Constrained Baseline), yuv420p, 560x320, 465 kb/s, 30 fps, 30 tbr, 90k tbn, 60 tbc
  
      Metadata:
  
        creation_time   : 2010-03-20 21:29:11
  
      Stream #0.1(eng): Audio: aac, 48000 Hz, mono, s16, 83 kb/s
  
      Metadata:
  
        creation_time   : 2010-03-20 21:29:11
  
  [buffer @ 0x7274e0] w:560 h:320 pixfmt:yuv420p
  
  Output #0, yuv4mpegpipe, to 'small.y4m':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 0
  
      compatible_brands: mp42isomavc1
  
      creation_time   : 2010-03-20 21:29:11
  
      encoder         : Lavf53.21.1
  
      Stream #0.0(und): Video: rawvideo, yuv420p, 560x320, q=2-31, 200 kb/s, 90k tbn, 30 tbc
  
      Metadata:
  
        creation_time   : 2010-03-20 21:29:11
  
  Stream mapping:
  
    Stream #0.0 -> #0.0
  
  Press ctrl-c to stop encoding
  
  frame=  166 fps=  0 q=0.0 Lsize=   43576kB time=5.53 bitrate=64513.5kbits/s    
  
  video:0kB audio:0kB global headers:0kB muxing overhead inf%

  Head of the files

  Not sure if this is relevant, but the text content of both files begin like that :

  mobile_qcif_7.5fps.y4m
  
  YUV4MPEG2 W176 H144 F15:2 Ip A128:117
  
  FRAME
  
  
  
  small.y4m (invalid)
  
  YUV4MPEG2 W560 H320 F15:2 Ip A0:0 C420mpeg2 XYSCSS=420MPEG2
  
  FRAME

  Additional experiment

  Taking the sample mobile_qcif_7.5fps.y4m, turning it into a .mp4 file and then back into a .y4m produces an invalid file (at least for Chrome).

  Answer to comments in the answer of @SirDarius

  Following the suggestion of @SirDarius ; I tried the following commands.
  They failed to produce a valid file.

  # [COMMAND]   # [RESULT] [HEADER]
  
  ffmpeg -i small.mp4 -vf fps=7.5 -an -c:v rawvideo -f yuv4mpegpipe -pix_fmt yuv444p -y small_yuv444p.y4m   # KO YUV4MPEG2 W560 H320 F15:2 Ip A0:0 C444 XYSCSS=444
  
  ffmpeg -i small.mp4 -vf fps=7.5 -an -c:v rawvideo -f yuv4mpegpipe -pix_fmt yuv422p -y small_yuv422p.y4m   # KO YUV4MPEG2 W560 H320 F15:2 Ip A0:0 C422 XYSCSS=422
  
  ffmpeg -i small.mp4 -vf fps=7.5 -an -c:v rawvideo -f yuv4mpegpipe -pix_fmt yuv420p -y small_yuv420p.y4m   # KO YUV4MPEG2 W560 H320 F15:2 Ip A0:0 C420mpeg2 XYSCSS=420MPEG2
  
  ffmpeg -i small.mp4 -vf fps=7.5 -an -c:v rawvideo -f yuv4mpegpipe -pix_fmt yuv411p -y small_yuv411p.y4m   # KO   YUV4MPEG2 W560 H320 F15:2 Ip A0:0 C411 XYSCSS=411
  
  
  
  ffmpeg -i small.mp4 -vf fps=7.5 -an -c:v rawvideo -f yuv4mpegpipe -strict -1 -pix_fmt yuv420p9 -y small_yuv420p9.y4m   # KO YUV4MPEG2 W560 H320 F15:2 Ip A0:0 C420p9 XYSCSS=420P9
  
  ffmpeg -i small.mp4 -vf fps=7.5 -an -c:v rawvideo -f yuv4mpegpipe -strict -1 -pix_fmt yuv420p12 -y small_yuv420p12.y4m # KO YUV4MPEG2 W560 H320 F15:2 Ip A0:0 C420p12 XYSCSS=420P12
  
  ffmpeg -i small.mp4 -vf fps=7.5 -an -c:v rawvideo -f yuv4mpegpipe -strict -1 -pix_fmt yuv420p14 -y small_yuv420p14.y4m # KO YUV4MPEG2 W560 H320 F15:2 Ip A0:0 C420p14 XYSCSS=420P14
  
  ffmpeg -i small.mp4 -vf fps=7.5 -an -c:v rawvideo -f yuv4mpegpipe -strict -1 -pix_fmt yuv420p16 -y small_yuv420p16.y4m # KO YUV4MPEG2 W560 H320 F15:2 Ip A0:0 C420p16 XYSCSS=420P16

  When trying other formats (like yuv420p12be, which was in the output of -pix_fmts), I had the following output (hence my previous trials) :

  $  ffmpeg -i small.mp4 -vf fps=7.5 -an -c:v rawvideo -f yuv4mpegpipe -pix_fmt yuv420p12be -y small_yuv420p12be.y4m 
  
  ffmpeg version N-68884-g3ebd76a Copyright (c) 2000-2015 the FFmpeg developers
  
    built on Jan  6 2015 11:03:21 with gcc 4.8 (Ubuntu/Linaro 4.8.1-10ubuntu9)
  
    configuration: 
  
    libavutil      54. 16.100 / 54. 16.100
  
    libavcodec     56. 19.100 / 56. 19.100
  
    libavformat    56. 18.100 / 56. 18.100
  
    libavdevice    56.  3.100 / 56.  3.100
  
    libavfilter     5.  6.100 /  5.  6.100
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  1.100 /  1.  1.100
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x21d0220] overread end of atom 'colr' by 1 bytes
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'small.mp4':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 0
  
      compatible_brands: mp42isomavc1
  
      creation_time   : 2010-03-20 21:29:11
  
      encoder         : HandBrake 0.9.4 2009112300
  
    Duration: 00:00:05.57, start: 0.000000, bitrate: 551 kb/s
  
      Stream #0:0(und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p(tv, bt709), 560x320, 465 kb/s, 30 fps, 30 tbr, 90k tbn, 60 tbc (default)
  
      Metadata:
  
        creation_time   : 2010-03-20 21:29:11
  
        encoder         : JVT/AVC Coding
  
      Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, mono, fltp, 83 kb/s (default)
  
      Metadata:
  
        creation_time   : 2010-03-20 21:29:11
  
  [yuv4mpegpipe @ 0x21d8180] ERROR: yuv4mpeg can only handle yuv444p, yuv422p, yuv420p, yuv411p and gray8 pixel formats. And using 'strict -1' also yuv444p9, yuv422p9, yuv420p9, yuv444p10, yuv422p10, yuv420p10, yuv444p12, yuv422p12, yuv420p12, yuv444p14, yuv422p14, yuv420p14, yuv444p16, yuv422p16, yuv420p16 and gray16 pixel formats. Use -pix_fmt to select one.
  
  Output #0, yuv4mpegpipe, to 'small_yuv420p12be.y4m':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 0
  
      compatible_brands: mp42isomavc1
  
      encoder         : Lavf56.18.100
  
      Stream #0:0(und): Video: rawvideo ([12][11]3Y / 0x59330B0C), yuv420p12be, 560x320, q=2-31, 200 kb/s, 7.50 fps, 7.50 tbn, 7.50 tbc (default)
  
      Metadata:
  
        creation_time   : 2010-03-20 21:29:11
  
        encoder         : Lavc56.19.100 rawvideo
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (h264 (native) -> rawvideo (native))
  
  Could not write header for output file #0 (incorrect codec parameters ?): Input/output error

  After that, I also tried to edit with an hexadecimal editor (bless) the small_yuv420p.y4m file. I replace C420mpeg2 by C420, and the file was accepted by Chrome.
  What does the number in 420p[number] correspond to ? It is not explained there.
  Is there any way to make ffmpeg output this kind of header files ?

  @SirDarius, thank you again for your help.

  The question

  (in case you forgot after this text blob)

  How can I convert the small.mp4 into a small.y4m file that has the same properties as the mobile_qcif_7.5fps.y4m file ?