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• What causes Firefox to refuse playing one specific MP4 that plays well on other browsers, resolution being the only difference ?

  3 décembre 2014, par Faro

  I’m a developer for a PHP powered website that allows the upload of videos which get converted to MP4 using ffmpeg. This setup worked pretty well so far, however today I came across a report of a user that couldn’t play one of the files in Firefox.

  I was unable to replicate the issue on my own machine at first, but using a fresh install of Windows 7 I actually got the same issue : The file will not play in Firefox, but works fine in Chrome. If called up directly, Firefox will say "Video can’t be played because the file is corrupt".
  When downloaded, Windows will also not create a thumbnail of the video for the file and WMP will only play the audio part.

  On my own machine the file works perfectly in WMP which made me wonder if it could be a codec issue (I do have the K-Lite Codec Pack installed), however I’ve compared the file to a working one and the only difference is the resolution, filesize and the format profile which is "High@L3.1" for a working file with a 720p resolution and "High@L4.0" for the non-working one (which is 1600x1200).

  I then read through the Wikipedia article on H.264/MPEG-4 AVC and began to wonder if the level might be the issue, and the tool I used (XMedia Recode) actually did not allow me to set a height bigger than 1080 on Level 4, however when I set the level to 5 and encoded the file again, it still wouldn’t play.

  I did find a note on the MDN page of supported formats which reads :

  Firefox/Firefox for Android/Firefox OS supports the format in some cases, but only when a third-party decoder is available, and the device hardware can handle the profile used to encode the MP4.

  I’m assuming that is why the codec pack would allow Firefox to play even the ’broken’ file on my machine, I still don’t understand though why Firefox does play some files but not this one, especially when Chrome on the same machine plays all of them.

  The line in PHP that starts the conversion is as follows :

  exec("/usr/local/bin/ffmpeg '-i' '" . $file_in . "' '-qscale' '4' '-y' '-threads' '1' '-acodec' 'libvo_aacenc' '-vcodec' 'h264' '" . $file_out . "' 2>&1", $buffer, $success);

  This should produce correct files, and this is indeed the first time a file has issues.

  MediaInfo provides this data for the file stream :

  Video
  
  ID                                       : 1
  
  Format                                   : AVC
  
  Format/Info                              : Advanced Video Codec
  
  Format profile                           : High@L4.0
  
  Format settings, CABAC                   : Yes
  
  Format settings, ReFrames                : 4 frames
  
  Codec ID                                 : avc1
  
  Codec ID/Info                            : Advanced Video Coding
  
  Duration                                 : 12mn 26s
  
  Bit rate                                 : 77.7 Kbps
  
  Width                                    : 1 600 pixels
  
  Height                                   : 1 200 pixels
  
  Display aspect ratio                     : 4:3
  
  Frame rate mode                          : Constant
  
  Frame rate                               : 30.000 fps
  
  Color space                              : YUV
  
  Chroma subsampling                       : 4:2:0
  
  Bit depth                                : 8 bits
  
  Scan type                                : Progressive
  
  Bits/(Pixel*Frame)                       : 0.001
  
  Stream size                              : 6.92 MiB (36%)
  
  Writing library                          : x264 core 142 r14 956c8d8
  
  Encoding settings                        : cabac=1 / ref=3 / deblock=1:0:0 / analyse=0x3:0x113 / me=hex / subme=7 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=1 / me_range=16 / chroma_me=1 / trellis=1 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=-2 / threads=1 / lookahead_threads=1 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=3 / b_pyramid=2 / b_adapt=1 / b_bias=0 / direct=1 / weightb=1 / open_gop=0 / weightp=2 / 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
  
  Language                                 : English
  
  
  
  Audio
  
  ID                                       : 2
  
  Format                                   : AAC
  
  Format/Info                              : Advanced Audio Codec
  
  Format profile                           : LC
  
  Codec ID                                 : 40
  
  Duration                                 : 12mn 26s
  
  Duration_LastFrame                       : -10ms
  
  Bit rate mode                            : Constant
  
  Bit rate                                 : 128 Kbps
  
  Channel(s)                               : 2 channels
  
  Channel positions                        : Front: L R
  
  Sampling rate                            : 44.1 KHz
  
  Compression mode                         : Lossy
  
  Stream size                              : 11.4 MiB (60%)
  
  Language                                 : English

  I’ve uploaded a zip with 3 versions of the file, the untouched one, the converted one with the same settings the website would use, and another converted one with level 5.

  Maybe I’m missing something obvious, but I couldn’t find anything wrong with it, what do I need to change in order to produce a file that will work natively in Firefox ?

  Also, this is my first question on SO, so if you see anything that I can improve, please let me know :-)

  Edit : This is the output of calling ffmpeg (with the faststart option)

  /usr/local/bin/ffmpeg '-i' '49cf594e91d0dac376aa0b2b96972ded.mp4' '-movflags' '+faststart' '-qscale' '4' '-y' '-threads' '1' '-acodec' 'libvo_aacenc' '-vcodec' 'h264' 'test.mp4'
  
  
  
  ffmpeg version 1.2.5-   http://johnvansickle.com/ffmpeg/    Copyright (c) 2000-2014 the FFmpeg developers
  
    built on Jan 22 2014 20:28:02 with gcc 4.8 (Debian 4.8.2-14)
  
    configuration: --enable-gpl --enable-version3 --disable-shared --disable-debug --enable-runtime-cpudetect --enable-libmp3lame --enable-libx264 --enable-libspeex --enable-libvorbis --enable-libvpx --enable-libxvid --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libtheora --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-gray --enable-libopenjpeg --disable-ffserver
  
    libavutil      52. 18.100 / 52. 18.100
  
    libavcodec     54. 92.100 / 54. 92.100
  
    libavformat    54. 63.104 / 54. 63.104
  
    libavdevice    54.  3.103 / 54.  3.103
  
    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 '49cf594e91d0dac376aa0b2b96972ded.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf54.63.104
  
    Duration: 00:12:26.37, start: 0.036281, bitrate: 214 kb/s
  
      Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1600x1200 [SAR 1:1 DAR 4:3], 77 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 128 kb/s
  
      Metadata:
  
        handler_name    : SoundHandler
  
  Please use -q:a or -q:v, -qscale is ambiguous
  
  [libx264 @ 0x2802ac0] using SAR=1/1
  
  [libx264 @ 0x2802ac0] using cpu capabilities: MMX2 SSE2Fast LZCNT
  
  [libx264 @ 0x2802ac0] profile High, level 4.0
  
  [libx264 @ 0x2802ac0] 264 - core 142 r14 956c8d8 - H.264/MPEG-4 AVC codec - Copyleft 2003-2014 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=1 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 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 'test.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf54.63.104
  
      Stream #0:0(eng): Video: h264 ([33][0][0][0] / 0x0021), yuv420p, 1600x1200 [SAR 1:1 DAR 4:3], q=-1--1, 15360 tbn, 30 tbc
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(eng): Audio: aac ([64][0][0][0] / 0x0040), 44100 Hz, stereo, s16, 128 kb/s
  
      Metadata:
  
        handler_name    : SoundHandler
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (h264 -> libx264)
  
    Stream #0:1 -> #0:1 (aac -> libvo_aacenc)
  
  Press [q] to stop, [?] for help
  
  Starting second pass: moving header on top of the file30.77 bitrate= 202.5kbits/s dup=1 drop=0
  
  frame=15331 fps= 13 q=29.0 Lsize=   13201kB time=00:08:31.03 bitrate= 211.6kbits/s dup=1 drop=0
  
  video:4673kB audio:7986kB subtitle:0 global headers:0kB muxing overhead 4.286767%
  
  [libx264 @ 0x2802ac0] frame I:63    Avg QP:12.37  size: 39759
  
  [libx264 @ 0x2802ac0] frame P:3905  Avg QP:20.36  size:   313
  
  [libx264 @ 0x2802ac0] frame B:11363 Avg QP:33.67  size:    93
  
  [libx264 @ 0x2802ac0] consecutive B-frames:  1.1%  0.1%  0.2% 98.6%
  
  [libx264 @ 0x2802ac0] mb I  I16..4: 48.0% 41.5% 10.5%
  
  [libx264 @ 0x2802ac0] mb P  I16..4:  0.1%  0.2%  0.0%  P16..4:  0.5%  0.0%  0.0%  0.0%  0.0%    skip:99.1%
  
  [libx264 @ 0x2802ac0] mb B  I16..4:  0.0%  0.0%  0.0%  B16..8:  0.3%  0.0%  0.0%  direct: 0.0%  skip:99.7%  L0:50.2% L1:48.9% BI: 0.8%
  
  [libx264 @ 0x2802ac0] 8x8 transform intra:42.4% inter:36.9%
  
  [libx264 @ 0x2802ac0] coded y,uvDC,uvAC intra: 6.9% 13.4% 9.4% inter: 0.0% 0.1% 0.0%
  
  [libx264 @ 0x2802ac0] i16 v,h,dc,p: 82% 17%  1%  0%
  
  [libx264 @ 0x2802ac0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 30% 20% 49%  0%  0%  0%  0%  0%  0%
  
  [libx264 @ 0x2802ac0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 41% 20% 18%  3%  4%  4%  4%  4%  3%
  
  [libx264 @ 0x2802ac0] i8c dc,h,v,p: 80% 12%  7%  1%
  
  [libx264 @ 0x2802ac0] Weighted P-Frames: Y:0.3% UV:0.3%
  
  [libx264 @ 0x2802ac0] ref P L0: 74.7%  3.8% 10.6% 10.9%  0.0%
  
  [libx264 @ 0x2802ac0] ref B L0: 70.3% 28.9%  0.8%
  
  [libx264 @ 0x2802ac0] ref B L1: 97.9%  2.1%
  
  [libx264 @ 0x2802ac0] kb/s:74.90

• FFMPEG x264 MP4 Encoding all grey

  7 mars 2013, par Brianjs

  I am currently using FFMPEG v1.1 on CentOS 6.3.

  I configured FFMPEG with :

  ./configure --arch=x86_64  --enable-libmp3lame  --enable-librtmp  --enable-libtheora --enable-libvorbis  --enable-libx264 --enable-pthreads --enable-gpl --enable-runtime-cpudetect 

  when I run a simple command to record live input to MP4 by :

  ffmpeg -f video4linux2 -s 640x480 -i /dev/video0 /home/irdb/Desktop/test.mp4

  I get nothing, just a grey screen with some artifacts around the edges. However when I run the same command as .MPG it comes out fine. I need it in MP4 format however.

  On a side note I am running x264-0.120 installed through yum

  My question is, is there a problem with the way I compiled ffmpeg ? Or is it possibly something else ?

  edit :

  Output from example as requested :

  # ffmpeg -f video4linux2 -s 640x480 -t 5 -i /dev/video0 -strict 2 /home/irdb/Desktop/test.mp4
  
  ffmpeg version N-50546-g1f5b5b8 Copyright (c) 2000-2013 the FFmpeg developers
  
  built on Mar  7 2013 00:17:44 with gcc 4.4.6 (GCC) 20120305 (Red Hat 4.4.6-4)
  
  configuration: --enable-libmp3lame --enable-librtmp --enable-libtheora --enable-   libvorbis --enable-libx264 --enable-pthreads --enable-gpl --enable-runtime-cpudetect
  
  libavutil      52. 18.100 / 52. 18.100
  
  libavcodec     54. 92.100 / 54. 92.100
  
  libavformat    54. 63.104 / 54. 63.104
  
  libavdevice    54.  3.103 / 54.  3.103
  
  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
  
  [video4linux2,v4l2 @ 0x3025120] Estimating duration from bitrate, this may be   inaccurate
  
  Input #0, video4linux2,v4l2, from '/dev/video0':
  
  Duration: N/A, start: 128.640356, bitrate: 147456 kb/s
  
  Stream #0:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 640x480, 147456 kb/s, 30 fps, 30 tbr, 1000k tbn, 1000k tbc
  
  [libx264 @ 0x3026f80] using cpu capabilities: MMX2 SSE2Fast SSEMisalign LZCNT
  
  [libx264 @ 0x3026f80] profile High 4:2:2, level 3.0, 4:2:2 8-bit
  
  [libx264 @ 0x3026f80] 264 - core 130 r2274 c832fe9 - H.264/MPEG-4 AVC codec -  Copyleft 2003-2013 - http://www.videolan.org/x264.html - options: cabac=1 ref=3  deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1  me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=6 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1  interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1  b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 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 '/home/irdb/Desktop/test.mp4':
  
  Metadata:
  
  encoder         : Lavf54.63.104
  
  Stream #0:0: Video: h264 ([33][0][0][0] / 0x0021), yuv422p, 640x480, q=-1--1, 15360 tbn, 30 tbc
  
  Stream mapping:
  
  Stream #0:0 -> #0:0 (rawvideo -> libx264)
  
  Press [q] to stop, [?] for help
  
  frame=   32 fps=0.0 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A dup=21    drframe=   46 fps= 46 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A dup=28 drframe=    62 fps= 41 q=29.0 size=      71kB time=00:00:00.33 bitrate=1735.2kbits/frame=   76 fps=  38 q=29.0 size=     169kB time=00:00:00.80 bitrate=1731.2kbits/frame=   93 fps= 37  q=29.0 size=     311kB time=00:00:01.36 bitrate=1862.3kbits/frame=  107 fps= 35 q=29.0  size=     423kB time=00:00:01.83 bitrate=1891.0kbits/frame=  123 fps= 35 q=29.0 size=      537kB time=00:00:02.36 bitrate=1860.2kbits/frame=  139 fps= 34 q=29.0 size=     664kB  time=00:00:02.90 bitrate=1876.0kbits/frame=  150 fps= 29 q=-1.0 Lsize=    1174kB  time=00:00:04.93 bitrate=1948.7kbits/s dup=81 drop=0    
  
  video:1172kB audio:0kB subtitle:0 global headers:0kB muxing overhead 0.133409%
  
  [libx264 @ 0x3026f80] frame I:2     Avg QP:23.22  size: 28460
  
  [libx264 @ 0x3026f80] frame P:136   Avg QP:24.45  size:  8397
  
  [libx264 @ 0x3026f80] frame B:12    Avg QP:26.18  size:    42
  
  [libx264 @ 0x3026f80] consecutive B-frames: 88.0%  4.0%  0.0%  8.0%
  
  [libx264 @ 0x3026f80] mb I  I16..4: 47.1% 28.8% 24.1%
  
  [libx264 @ 0x3026f80] mb P  I16..4:  4.3%  1.9%  1.2%  P16..4: 29.0% 11.4%  9.2%      0.0%  0.0%    skip:43.0%
  
  [libx264 @ 0x3026f80] mb B  I16..4:  0.0%  0.0%  0.0%  B16..8:  1.5%  0.0%  0.0%   direct: 0.0%  skip:98.5%  L0:16.5% L1:83.5% BI: 0.0%
  
  [libx264 @ 0x3026f80] 8x8 transform intra:26.4% inter:30.7%
  
  [libx264 @ 0x3026f80] coded y,uvDC,uvAC intra: 85.2% 95.6% 83.5% inter: 10.9% 38.6% 24.0%
  
  [libx264 @ 0x3026f80] i16 v,h,dc,p: 33% 19% 40%  8%
  
  [libx264 @ 0x3026f80] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu:  6% 12% 55%  5%  3%  4%  4%  3%  8%
  
  [libx264 @ 0x3026f80] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 15%  9% 63%  3%  2%  2%  2%  2%  2%
  
  [libx264 @ 0x3026f80] i8c dc,h,v,p: 66% 11% 14%  9%
  
  [libx264 @ 0x3026f80] Weighted P-Frames: Y:0.0% UV:0.0%
  
  [libx264 @ 0x3026f80] ref P L0: 56.6%  7.5%  8.1% 27.8%
  
  [libx264 @ 0x3026f80] ref B L0: 83.3% 16.7%
  
  [libx264 @ 0x3026f80] ref B L1: 90.7%  9.3%
  
  [libx264 @ 0x3026f80] kb/s:1918.95

• Setting B frames in a video with ffmpeg

  30 juin 2013, par Robert Cantarutti

  According to ffmpeg manual, setting -g is to define space between "I" frames, and setting -bf to use "B" frames. The former I got, but the latter not.

  The goal : I'm trying to have a video with a GOP 3,12 (M= 3, N=12).
  That means : 2 "B" frames separating each "P" frames, and "I" frames with 12 frames of distance. Or simply : "IBBPBBPBBPBBI"

  I think that I got only the N=12, using the commands below :

  1. ffmpeg -s cif -r 30 -b 64000 -bt 3200 -g 12 -y -i video.yuv -vcodec mpeg4 video.m4v
  2. MP4Box -hint -mtu 1460 -fps 30 -add video.m4v video.mp4
  3. ffmpeg -y -i video.mp4 video_ref.yuv
  4. ../cmd/psnr 352 288 420 video.yuv video_ref.yuv > psnr_ref.txt
  5. ../cmd/mp4trace -f -s 192.168.0.2 12346 video.mp4 > trace
  6. head -n 20 trace

  Result :

  [robert@10-2Fontes]$ head -n 20 trace
  
  1   H   12002   9   0.000
  
  2   P   11479   8   0.034
  
  3   P   12021   9   0.066
  
  4   P   11239   8   0.099
  
  5   P   5407    4   0.134
  
  6   P   2735    2   0.166
  
  7   P   1014    1   0.199
  
  8   P   850 1   0.232
  
  9   P   619 1   0.265
  
  10  P   979 1   0.298
  
  11  P   813 1   0.331
  
  12  P   806 1   0.364
  
  13  H   5109    4   0.396

  *Note, the most important is the command -g 12 in ffmpeg, but I writing all the commands. The video that I'm using is the "highway", from cif page videos : http://www2.tkn.tu-berlin.de/research/evalvid/cif.html

  I don't know why the result trace is using "H" instead of "I".

  I tried to put -bf 2 in ffmpeg command, but did not worked (I think because I saw no "B" indications in the result)

  List item

  ffmpeg -s cif -r 30 -b 64000 -bt 3200 -g 12 -bf 2 -y -i video.yuv -vcodec mpeg4 video.m4v

  Result :

  [robert@10-2Fontes]$ head -n 20 trace
  
  1   H   12002   9   0.001
  
  2   P   11479   8   0.034
  
  3   P   12021   9   0.067
  
  4   P   11239   8   0.100
  
  5   P   5407    4   0.132
  
  6   P   2735    2   0.166
  
  7   P   1014    1   0.199
  
  8   P   850 1   0.232
  
  9   P   619 1   0.265
  
  10  P   979 1   0.298
  
  11  P   813 1   0.331
  
  12  P   806 1   0.363
  
  13  H   5109    4   0.400