[FFmpeg-user] flv video truncated in conversion to mxf

Tue May 1 00:50:26 CEST 2012

I am using ffmpeg (version 0.10.2) to convert an flv (Sorenson Spark video & Speex audio) into an MXF file. I get a warning "Missing Speex header, assuming defaults." and transcoding proceeds. But the 50-second input file is truncated to 46 seconds in the MXF output. 
This video was generated using a Flex app and FMS Server 4.0. 
I have provided detailed outputs below.
Would greatly appreciate it if anyone can shed any light on why the file is getting truncated.

Thanks,
Suneetha

PS: One thing I noticed is that MediaInfo shows the Audio Sampling rate as 5500 Hz while ffmpeg is assuming that it is 16000 Hz. I tried to force ffmpeg to use 5500 as the Audio sampling rate for the input file by providing "-ar 5500" before providing -i <input-file>. But that gave me the error "Option sample_rate not found.".

Command line I am using:
====================
ffmpeg -i ~/MEDIA/test7.flv -ss 0.000000 -r 29.97 -threads 4 -vcodec mpeg2video -pix_fmt yuv422p -q:v 1 -intra -ar 48000 -async 1 -q:a 1 -f mxf test-out.mxf
(I tried adding the -t option. That did not help) 

Output
=====
$ffmpeg -i ~/MEDIA/test7.flv -ss 0.000000 -r 29.97 -threads 4 -vcodec mpeg2video -pix_fmt yuv422p -q:v 1 -intra -ar 48000 -async 1 -q:a 1 -f mxf test-out.mxf
ffmpeg version 0.10.2 Copyright (c) 2000-2012 the FFmpeg developers
  built on Apr  4 2012 10:29:24 with gcc 4.4.3
  configuration: --prefix=/home/suneetha --enable-pthreads --disable-mmx --disable-mmx2 --enable-libmp3lame --enable-libspeex --enable-libvpx --enable-libvorbis --enable-libx264 --enable-gpl 
  libavutil      51. 35.100 / 51. 35.100
  libavcodec     53. 61.100 / 53. 61.100
  libavformat    53. 32.100 / 53. 32.100
  libavdevice    53.  4.100 / 53.  4.100
  libavfilter     2. 61.100 /  2. 61.100
  libswscale      2.  1.100 /  2.  1.100
  libswresample   0.  6.100 /  0.  6.100
  libpostproc    52.  0.100 / 52.  0.100
[libspeex @ 0x338bd10] Missing Speex header, assuming defaults.
Input #0, flv, from '/home/suneetha/MEDIA/test7.flv':
  Metadata:
    canSeekToEnd    : false
    createdby       : FMS 4.0
    creationdate    : Wed Mar 28 15:33:18 2012
  Duration: 00:00:50.71, start: 0.000000, bitrate: 430 kb/s
    Stream #0:0: Video: flv1, yuv420p, 640x360, 1k tbr, 1k tbn, 1k tbc
    Stream #0:1: Audio: speex, 16000 Hz, 1 channels, s16
[buffer @ 0x338d890] w:640 h:360 pixfmt:yuv420p tb:1/1000000 sar:0/1 sws_param:
[buffersink @ 0x349fb80] auto-inserting filter 'auto-inserted scale 0' between the filter 'src' and the filter 'out'
[scale @ 0x338a4e0] w:640 h:360 fmt:yuv420p -> w:640 h:360 fmt:yuv422p flags:0x4
[libspeex @ 0x338bd10] Missing Speex header, assuming defaults.
Output #0, mxf, to 'test-out.mxf':
  Metadata:
    canSeekToEnd    : false
    createdby       : FMS 4.0
    creationdate    : Wed Mar 28 15:33:18 2012
    encoder         : Lavf53.32.100
    Stream #0:0: Video: mpeg2video, yuv422p, 640x360, q=2-31, 200 kb/s, 29.97 tbn, 29.97 tbc
    Stream #0:1: Audio: pcm_s16le, 48000 Hz, 1 channels, s16, 768 kb/s
Stream mapping:
  Stream #0:0 -> #0:0 (flv -> mpeg2video)
  Stream #0:1 -> #0:1 (libspeex -> pcm_s16le)
Press [q] to stop, [?] for help
frame=   46 fps=  0 q=1.0 size=       0kB time=00:00:00.00 bitrate=   0.0kbits/s dframe=  106 fps=104 q=1.0 size=       0kB time=00:00:00.00 bitrate=   0.0kbits/s dframe=  151 fps= 99 q=1.0 size=       0kB time=00:00:00.00 bitrate=   0.0kbits/s dframe=  199 fps= 98 q=1.0 size=       0kB time=00:00:00.00 bitrate=   0.0kbits/s dframe=  249 fps= 98 q=1.0 size=       0kB time=00:00:00.00 bitrate=   0.0kbits/s dframe=  301 fps= 99 q=1.0 size=       0kB time=00:00:00.00 bitrate=   0.0kbits/s dMultiple frames in a packet from stream 1
frame=  351 fps= 99 q=1.0 size=   16463kB time=00:00:11.67 bitrate=11548.4kbits/s frame=  399 fps= 98 q=1.0 size=   18784kB time=00:00:13.27 bitrate=11587.2kbits/s frame=  458 fps=100 q=1.0 size=   19378kB time=00:00:13.76 bitrate=11531.0kbits/s frame=  515 fps=102 q=1.0 size=   19378kB time=00:00:13.76 bitrate=11531.0kbits/s frame=  567 fps=102 q=1.0 size=   19378kB time=00:00:13.76 bitrate=11531.0kbits/s frame=  607 fps=100 q=1.0 size=   19378kB time=00:00:13.76 bitrate=11531.0kbits/s frame=  672 fps=102 q=1.0 size=   31632kB time=00:00:22.38 bitrate=11573.8kbits/s frame=  732 fps=103 q=1.0 size=   34466kB time=00:00:24.39 bitrate=11575.7kbits/s frame=  793 fps=104 q=1.0 size=   37314kB time=00:00:26.42 bitrate=11567.0kbits/s frame=  849 fps=105 q=1.0 size=   38997kB time=00:00:27.66 bitrate=11547.2kbits/s frame=  905 fps=105 q=1.0 size=   38997kB time=00:00:27.66 bitrate=11547.2kbits/s frame=  962 fps=106 q=1.0 size=   38997kB
 time=00:00:27.66 bitrate=11547.2kbits/s frame= 1020 fps=106 q=1.0 size=   38997kB time=00:00:27.66 bitrate=11547.2kbits/s frame= 1082 fps=107 q=1.0 size=   38997kB time=00:00:27.66 bitrate=11547.2kbits/s frame= 1142 fps=107 q=1.0 size=   38997kB time=00:00:27.66 bitrate=11547.2kbits/s frame= 1201 fps=108 q=1.0 size=   38997kB time=00:00:27.66 bitrate=11547.2kbits/s frame= 1245 fps=107 q=1.0 size=   58496kB time=00:00:41.50 bitrate=11544.7kbits/s frame= 1287 fps=106 q=1.0 size=   59379kB time=00:00:42.18 bitrate=11530.4kbits/s frame= 1339 fps=106 q=1.0 size=   62838kB time=00:00:44.64 bitrate=11530.3kbits/s frame= 1397 fps=106 q=1.0 size=   65133kB time=00:00:46.30 bitrate=11522.4kbits/s frame= 1457 fps=106 q=1.0 size=   65133kB time=00:00:46.30 bitrate=11522.4kbits/s frame= 1516 fps=107 q=1.0 size=   65133kB time=00:00:46.30 bitrate=11522.4kbits/s frame= 1516 fps=107 q=1.0 Lsize=   65230kB time=00:00:46.32 bitrate=11534.6kbits/s dup=273
 drop=0    
video:64603kB audio:0kB global headers:0kB muxing overhead 0.970393%

FFprobe output for input file
=====================
$ffprobe -i ~/MEDIA/test7.flv 
ffprobe version 0.10.2 Copyright (c) 2007-2012 the FFmpeg developers
  built on Apr  4 2012 10:29:24 with gcc 4.4.3
  configuration: --prefix=/home/suneetha --enable-pthreads --disable-mmx --disable-mmx2 --enable-libmp3lame --enable-libspeex --enable-libvpx --enable-libvorbis --enable-libx264 --enable-gpl
  libavutil      51. 35.100 / 51. 35.100
  libavcodec     53. 61.100 / 53. 61.100
  libavformat    53. 32.100 / 53. 32.100
  libavdevice    53.  4.100 / 53.  4.100
  libavfilter     2. 61.100 /  2. 61.100
  libswscale      2.  1.100 /  2.  1.100
  libswresample   0.  6.100 /  0.  6.100
  libpostproc    52.  0.100 / 52.  0.100
[libspeex @ 0x2000d90] Missing Speex header, assuming defaults.
Input #0, flv, from '/home/suneetha/MEDIA/test7.flv':
  Metadata:
    canSeekToEnd    : false
    createdby       : FMS 4.0
    creationdate    : Wed Mar 28 15:33:18 2012
  Duration: 00:00:50.71, start: 0.000000, bitrate: 430 kb/s
    Stream #0:0: Video: flv1, yuv420p, 640x360, 1k tbr, 1k tbn, 1k tbc
    Stream #0:1: Audio: speex, 16000 Hz, 1 channels, s16
[libspeex @ 0x2000d90] Missing Speex header, assuming defaults.

FFprobe output for output file
=====================
$ ffprobe -i test-out.mxf 
ffprobe version 0.10.2 Copyright (c) 2007-2012 the FFmpeg developers
  built on Apr  4 2012 10:29:24 with gcc 4.4.3
  configuration: --prefix=/home/suneetha --enable-pthreads --disable-mmx --disable-mmx2 --enable-libmp3lame --enable-libspeex --enable-libvpx --enable-libvorbis --enable-libx264 --enable-gpl
  libavutil      51. 35.100 / 51. 35.100
  libavcodec     53. 61.100 / 53. 61.100
  libavformat    53. 32.100 / 53. 32.100
  libavdevice    53.  4.100 / 53.  4.100
  libavfilter     2. 61.100 /  2. 61.100
  libswscale      2.  1.100 /  2.  1.100
  libswresample   0.  6.100 /  0.  6.100
  libpostproc    52.  0.100 / 52.  0.100
Input #0, mxf, from 'test-out.mxf':
  Duration: 00:00:46.34, start: 0.000000, bitrate: 11529 kb/s
    Stream #0:0: Video: mpeg2video (4:2:2), yuv422p, 640x360 [SAR 1:1 DAR 16:9], 104857 kb/s, 29.97 fps, 29.97 tbr, 29.97 tbn, 59.94 tbc
    Stream #0:1: Audio: pcm_s16le, 48000 Hz, 1 channels, s16, 768 kb/s