[FFmpeg-user] codec frame rate differs from container frame rate for mpeg2video in mov container generated from AVCHD

[Robert Krüger]

Hi,

I converted an interlaced AVCHD file from a Sony HDR-CX-6 Camcorder to  
mpeg2video in a mov container with the following command line

ffmpeg -i mayrhofen-full-507-seconds-1080i.m2ts -t 5 -y -vcodec  
mpeg2video -acodec copy -deinterlace test.mov

with the output:

FFmpeg version SVN-r19313, Copyright (c) 2000-2009 Fabrice Bellard, et  
al.
   configuration: --enable-libx264 --enable-gpl --enable-libfaac -- 
enable-nonfree --enable-libmp3lame --enable-libxvid
   libavutil     50. 3. 0 / 50. 3. 0
   libavcodec    52.32. 0 / 52.32. 0
   libavformat   52.36. 0 / 52.36. 0
   libavdevice   52. 2. 0 / 52. 2. 0
   libswscale     0. 7. 1 /  0. 7. 1
   built on Jul  1 2009 12:23:03, gcc: 4.0.1 (Apple Inc. build 5490)
Input #0, mpegts, from 'mayrhofen-full-507-seconds-1080i.m2ts':
   Duration: 00:08:28.07, start: 1.000067, bitrate: 7386 kb/s
   Program 1
     Stream #0.0[0x1011]: Video: h264, yuv420p, 1440x1080 [PAR 4:3 DAR  
16:9], 50 tbr, 90k tbn, 50 tbc
     Stream #0.1[0x1100]: Audio: ac3, 48000 Hz, 5.1, s16, 448 kb/s
Output #0, mov, to 'test.mov':
     Stream #0.0: Video: mpeg2video, yuv420p, 1440x1080 [PAR 4:3 DAR  
16:9], q=2-31, 200 kb/s, 50 tbn, 50 tbc
     Stream #0.1: Audio: ac3, 48000 Hz, 5.1, s16, 448 kb/s
Stream mapping:
   Stream #0.0 -> #0.0
   Stream #0.1 -> #0.1
Press [q] to stop encoding
frame=  141 fps= 26 q=31.0 Lsize=    2228kB time=5.03  
bitrate=3626.9kbits/s
video:1952kB audio:273kB global headers:0kB muxing overhead 0.134928%

and the resulting file causes the following warning

ffmpeg -i test.mov
FFmpeg version SVN-r19313, Copyright (c) 2000-2009 Fabrice Bellard, et  
al.
   configuration: --enable-libx264 --enable-gpl --enable-libfaac -- 
enable-nonfree --enable-libmp3lame --enable-libxvid
   libavutil     50. 3. 0 / 50. 3. 0
   libavcodec    52.32. 0 / 52.32. 0
   libavformat   52.36. 0 / 52.36. 0
   libavdevice   52. 2. 0 / 52. 2. 0
   libswscale     0. 7. 1 /  0. 7. 1
   built on Jul  1 2009 12:23:03, gcc: 4.0.1 (Apple Inc. build 5490)

Seems stream 0 codec frame rate differs from container frame rate:  
100.00 (100/1) -> 25.00 (25/1)
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'test.mov':
   Duration: 00:00:05.66, start: 0.000000, bitrate: 3224 kb/s
     Stream #0.0(eng): Video: mpeg2video, yuv420p, 1440x1080 [PAR 4:3  
DAR 16:9], 104857 kb/s, 25 tbr, 50 tbn, 100 tbc
     Stream #0.1(eng): Audio: ac3, 48000 Hz, 6 channels, s16
At least one output file must be specified

Is this normal? Both ffplay and VLC play the resulting file at the  
correct speed but one posting in the mailing list by dark shikari  
stated that a mismatch of these frame rates indicate a problem on the  
encoding side.

If this is indeed a bug and you need additional info, please let me  
know.

A file from that camera has already been uploaded for the (now fixed)  
bug report #475.

Regards,

Robert