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• Why is ffmpeg start time non-zero in .ts format ?

  22 janvier 2014, par geekydel

  I'm using ffmpeg to transcode video to .ts format, and I am getting unexpected start times in the output file.

  To simplify things, I've started with a nice simple AVI file (no audio) :

  ffmpeg -i in.avi 
  
  ...
  
  Input #0, avi, from 'in.avi':
  
    Metadata:
  
      encoder         : Lavf55.25.100
  
    Duration: 00:00:05.00, start: 0.000000, bitrate: 448 kb/s
  
      Stream #0:0: Video: mpeg4 (Simple Profile) (FMP4 / 0x34504D46), yuv420p, 480x270 [SAR 1:1 DAR 16:9], 24 tbr, 24 tbn, 24 tbc

  Duration=5s, startTime=0s, as expected.

  However, if I transcode to .ts file, with no customisation :

  ffmpeg -i in.avi -y out.ts
  
  ...
  
  Input #0, avi, from 'in.avi':
  
    Metadata:
  
      encoder         : Lavf55.25.100
  
    Duration: 00:00:05.00, start: 0.000000, bitrate: 448 kb/s
  
      Stream #0:0: Video: mpeg4 (Simple Profile) (FMP4 / 0x34504D46), yuv420p, 480x270 [SAR 1:1 DAR 16:9], 24 tbr, 24 tbn, 24 tbc
  
  Output #0, mpegts, to 'out.ts':
  
    Metadata:
  
      encoder         : Lavf55.25.100
  
      Stream #0:0: Video: mpeg2video, yuv420p, 480x270 [SAR 1:1 DAR 16:9], q=2-31, 200 kb/s, 90k tbn, 24 tbc
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (mpeg4 -> mpeg2video)
  
  Press [q] to stop, [?] for help
  
  frame=  120 fps=0.0 q=31.0 Lsize=     315kB time=00:00:04.95 bitrate= 519.9kbits/s dup=1 drop=0    
  
  video:277kB audio:0kB subtitle:0 global headers:0kB muxing overhead 13.491544%

  Then I get a very odd parameters (Duration=4:96s, startTime=1.441667) :

  ffmpeg -i out.ts
  
  ...
  
  Input #0, mpegts, from 'out.ts':
  
    Duration: 00:00:04.96, start: 1.441667, bitrate: 519 kb/s
  
    Program 1 
  
      Metadata:
  
        service_name    : Service01
  
        service_provider: FFmpeg
  
      Stream #0:0[0x100]: Video: mpeg2video (Main) ([2][0][0][0] / 0x0002), yuv420p(tv), 480x270 [SAR 1:1 DAR 16:9], max. 104857 kb/s, 24 fps, 24 tbr, 90k tbn, 48 tbc

  Now, I can just about understand why the transcode might lose a couple of frames, which explains the duration, but I can't see why the start time should be any different to the AVI file's start time.

  I have tried transcoding to .mp4, .webm and .mov, and in each case we get the 'correct' start time of 0.0s. Can anybody help explain why .ts files behave differently ?

  Thanks in advance !

  (ffmpeg version information :)

  ffmpeg version N-60031-ga459891 Copyright (c) 2000-2014 the FFmpeg developers
  
    built on Jan 21 2014 05:31:54 with gcc 4.6 (Debian 4.6.3-1)
  
    configuration: --prefix=/root/ffmpeg-static/64bit --extra-cflags='-I/root/ffmpeg-static/64bit/include -static' --extra-ldflags='-L/root/ffmpeg-static/64bit/lib -static' --extra-libs='-lxml2 -lexpat -lfreetype' --enable-static --disable-shared --disable-ffserver --disable-doc --enable-bzlib --enable-zlib --enable-postproc --enable-runtime-cpudetect --enable-libx264 --enable-gpl --enable-libtheora --enable-libvorbis --enable-libmp3lame --enable-gray --enable-libass --enable-libfreetype --enable-libopenjpeg --enable-libspeex --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-version3 --enable-libvpx
  
    libavutil      52. 63.100 / 52. 63.100
  
    libavcodec     55. 48.102 / 55. 48.102
  
    libavformat    55. 25.100 / 55. 25.100
  
    libavdevice    55.  5.102 / 55.  5.102
  
    libavfilter     4.  1.100 /  4.  1.100
  
    libswscale      2.  5.101 /  2.  5.101
  
    libswresample   0. 17.104 /  0. 17.104
  
    libpostproc    52.  3.100 / 52.  3.100

• configure Xuggler on Ubuntu 14-04

  22 juillet 2015, par Aida

  I was trying to install Xuggle on Ubuntu with this tutorial

  But when I used ant stage it doesn`t work. I see these commands on the terminal

  > root@test1:~# ant stage Unable to locate tools.jar. Expected to find
  
  > it in /usr/lib/jvm/java-7-openjdk-amd64/lib/tools.jar Buildfile:
  
  > build.xml does not exist! Build failed

  Do you have any idea how I can fix it ?

• Using ffmpeg to combine small mp4 chunks ?

  20 mai 2015, par shiny formica

  I’m trying to convert batches of png images into a single mp4 x264 video using ffmpeg. The conversion, for reasons I won’t go into, converts groups of frames into short mp4 chunks and then I want to take those chunks and merge them into the final video at a specific fps (in this case 30fps).

  My understanding of ffmpeg and the x264 options is too limited, and while I can produce the individual mp4 chunks from the source png frames without trouble, the final merge always ends up duplicating and/or dropping frames especially with very short chunks (< 4 frames).

  The conversion from png to mp4 uses this command :

  ffmpeg -start_number 1001 -framerate 30 -f image2 -i 'intermediate.%d.png' -c:v libx264 -crf 1 -pix_fmt yuv420p -movflags +faststart -frames:v 4 -r 30 chunk.1.mp4 -y

  which appears to work as expected, I get a playable mp4 chunk of, in this case, 4 frames of the sequence of png images at 30fps. The length of each chunk can be anywhere from 1 frame to around 100 frames.

  When all the chunks are generated, I’ve been trying to use the concat demuxer to combine without re-encoding, placing all the source chunk paths in a file :

  concat.txt :

  file 'chunk.1.mp4'
  
  file 'chunk.2.mp4'
  
  file 'chunk.3.mp4'
  
  ...

  and then running this ffmpeg command :

  ffmpeg -f concat -i concat.txt -c:v copy merged.mp4 -y

  but it says this during the concatenation :

  [concat @ 0x315ff80] Estimating duration from bitrate, this may be inaccurate

  and the resulting mp4 has dropped/duplicated frames. So I tried adding duration info to the concat.txt file :

  file 'chunk.1.mp4'
  
  duration 0.133333
  
  file 'chunk.2.mp4'
  
  duration 0.133333
  
  file 'chunk.3.mp4'
  
  duration 0.066666

  in this case, two 4-frame/30fps chunks and one 2-frame/30fps chunk. Which gets rid of that estimation warning, but the result is still duplicating/dropping frames.

  I’m not sure where I’m going wrong here...what do I need to do either in the production of the short mp4 segments, or in the combination stage, to get a single mp4 at the right framerate with no duplicated or dropped frames ?

  As suggested, here’s the console output for the conversion from png->mp4 chunks :

  ffmpeg -loglevel verbose -start_number 1001 -framerate 30 -f image2 -i 'intermediate.%d.png' -c:v libx264 -crf 1 -pix_fmt yuv420p -movflags +faststart -frames:v 4 -r 30 chunk.1.mp4 -y
  
  ffmpeg version 2.5.4 Copyright (c) 2000-2015 the FFmpeg developers
  
    built on Feb 26 2015 10:23:42 with gcc 4.4.7 (GCC) 20120313 (Red Hat 4.4.7-3)
  
    configuration: --prefix=/dept/srd/vendor/ffmpeg/bundle.rhel6/ffmpeg2.5.4 --enable-static --enable-pthreads --enable-gpl --enable-version3 --disable-ffserver --disable-ffplay --disable-ffprobe --enable-x11grab --enable-nonfree --extra-cflags=-I/dept/srd/vendor/ffmpeg/extern/rhel6/include --extra-ldflags=-L/dept/srd/vendor/ffmpeg/extern/rhel6/lib --enable-libx264 --enable-fontconfig --enable-libfreetype --enable-swscale --enable-libmp3lame --enable-libfaac --disable-yasm
  
    libavutil      54. 15.100 / 54. 15.100
  
    libavcodec     56. 13.100 / 56. 13.100
  
    libavformat    56. 15.102 / 56. 15.102
  
    libavdevice    56.  3.100 / 56.  3.100
  
    libavfilter     5.  2.103 /  5.  2.103
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  1.100 /  1.  1.100
  
    libpostproc    53.  3.100 / 53.  3.100
  
  Input #0, image2, from 'intermediate.%d.png':
  
    Duration: 00:00:00.27, start: 0.000000, bitrate: N/A
  
      Stream #0:0: Video: png, rgba, 1024x1024 (0x0), 30 fps, 30 tbr, 30 tbn, 30 tbc
  
  [graph 0 input from stream 0:0 @ 0x273e9c0] w:1024 h:1024 pixfmt:rgba tb:1/30 fr:30/1 sar:0/1 sws_param:flags=2
  
  [auto-inserted scaler 0 @ 0x2737ea0] w:iw h:ih flags:'0x4' interl:0
  
  [format @ 0x273ece0] auto-inserting filter 'auto-inserted scaler 0' between the filter 'Parsed_null_0' and the filter 'format'
  
  [auto-inserted scaler 0 @ 0x2737ea0] w:1024 h:1024 fmt:rgba sar:0/1 -> w:1024 h:1024 fmt:yuv420p sar:0/1 flags:0x4
  
  [libx264 @ 0x273c540] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
  
  [libx264 @ 0x273c540] profile High, level 3.2
  
  [libx264 @ 0x273c540] 264 - core 142 - 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=36 lookahead_threads=6 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=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
  
  Output #0, mp4, to 'chunk.1.mp4':
  
    Metadata:
  
      encoder         : Lavf56.15.102
  
      Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 1024x1024, q=-1--1, 30 fps, 15360 tbn, 30 tbc
  
      Metadata:
  
        encoder         : Lavc56.13.100 libx264
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (png (native) -> h264 (libx264))
  
  Press [q] to stop, [?] for help
  
  No more output streams to write to, finishing.
  
  [mp4 @ 0x273baa0] Starting second pass: moving the moov atom to the beginning of the file
  
  frame=    4 fps=0.0 q=-1.0 Lsize=     197kB time=00:00:00.06 bitrate=24228.7kbits/s    
  
  video:196kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.439751%
  
  Input file #0 (intermediate.%d.png):
  
    Input stream #0:0 (video): 8 packets read (2341016 bytes); 5 frames decoded; 
  
    Total: 8 packets (2341016 bytes) demuxed
  
  Output file #0 (chunk.3.mp4):
  
    Output stream #0:0 (video): 4 frames encoded; 4 packets muxed (201023 bytes); 
  
    Total: 4 packets (201023 bytes) muxed
  
  [libx264 @ 0x273c540] frame I:1     Avg QP: 0.47  size:116049
  
  [libx264 @ 0x273c540] frame P:1     Avg QP: 2.29  size: 37932
  
  [libx264 @ 0x273c540] frame B:2     Avg QP: 2.37  size: 23184
  
  [libx264 @ 0x273c540] consecutive B-frames: 25.0%  0.0% 75.0%  0.0%
  
  [libx264 @ 0x273c540] mb I  I16..4: 80.0%  4.5% 15.5%
  
  [libx264 @ 0x273c540] mb P  I16..4:  0.2%  0.1%  0.4%  P16..4:  8.1%  3.6%  3.7%  0.0%  0.0%    skip:83.9%
  
  [libx264 @ 0x273c540] mb B  I16..4:  0.0%  0.0%  0.0%  B16..8:  4.8%  1.2%  1.6%  direct: 4.3%  skip:88.1%  L0:38.6% L1:39.3% BI:22.1%
  
  [libx264 @ 0x273c540] 8x8 transform intra:4.6% inter:14.8%
  
  [libx264 @ 0x273c540] coded y,uvDC,uvAC intra: 20.7% 22.9% 22.8% inter: 8.7% 10.1% 10.0%
  
  [libx264 @ 0x273c540] i16 v,h,dc,p: 95%  1%  3%  1%
  
  [libx264 @ 0x273c540] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 21% 21% 22%  6%  6%  6%  7%  5%  6%
  
  [libx264 @ 0x273c540] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 20% 17% 18%  7%  8%  7%  8%  6%  8%
  
  [libx264 @ 0x273c540] i8c dc,h,v,p: 89%  4%  4%  3%
  
  [libx264 @ 0x273c540] Weighted P-Frames: Y:0.0% UV:0.0%
  
  [libx264 @ 0x273c540] ref B L1: 89.5% 10.5%
  
  [libx264 @ 0x273c540] kb/s:12020.88

  as I said, this appears to produce a valid mp4 at 30fps with no duplicated or dropped frames from the input images.

  Here’s the output of the combine phase :

  ffmpeg -loglevel verbose -f concat -i concat.txt -c:v copy merged.mp4 -y
  
  ffmpeg version 2.5.4 Copyright (c) 2000-2015 the FFmpeg developers
  
    built on Feb 26 2015 10:23:42 with gcc 4.4.7 (GCC) 20120313 (Red Hat 4.4.7-3)
  
    configuration: --prefix=/dept/srd/vendor/ffmpeg/bundle.rhel6/ffmpeg2.5.4 --enable-static --enable-pthreads --enable-gpl --enable-version3 --disable-ffserver --disable-ffplay --disable-ffprobe --enable-x11grab --enable-nonfree --extra-cflags=-I/dept/srd/vendor/ffmpeg/extern/rhel6/include --extra-ldflags=-L/dept/srd/vendor/ffmpeg/extern/rhel6/lib --enable-libx264 --enable-fontconfig --enable-libfreetype --enable-swscale --enable-libmp3lame --enable-libfaac --disable-yasm
  
    libavutil      54. 15.100 / 54. 15.100
  
    libavcodec     56. 13.100 / 56. 13.100
  
    libavformat    56. 15.102 / 56. 15.102
  
    libavdevice    56.  3.100 / 56.  3.100
  
    libavfilter     5.  2.103 /  5.  2.103
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  1.100 /  1.  1.100
  
    libpostproc    53.  3.100 / 53.  3.100
  
  Input #0, concat, from 'concat.txt':
  
    Duration: 00:00:00.67, start: 0.000000, bitrate: 2 kb/s
  
      Stream #0:0: Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1024x1024, 7791 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc
  
  Output #0, mp4, to 'merged.mp4':
  
    Metadata:
  
      encoder         : Lavf56.15.102
  
      Stream #0:0: Video: h264 ([33][0][0][0] / 0x0021), yuv420p, 1024x1024 (0x0), q=2-31, 7791 kb/s, 30 fps, 15360 tbn, 15360 tbc
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
  Press [q] to stop, [?] for help
  
  No more output streams to write to, finishing.
  
  frame=   20 fps=0.0 q=-1.0 Lsize=     748kB time=00:00:00.56 bitrate=10805.0kbits/s    
  
  video:746kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.141687%
  
  Input file #0 (concat.txt):
  
    Input stream #0:0 (video): 20 packets read (764361 bytes); 
  
    Total: 20 packets (764361 bytes) demuxed
  
  Output file #0 (merged.mp4):
  
    Output stream #0:0 (video): 20 packets muxed (764361 bytes); 
  
    Total: 20 packets (764361 bytes) muxed