[FFmpeg-user] mov->.dv rewrapping

[Папа Любящий]

Use : ffmpeg -i SYNCTEST.mov -f dv -vcodec copy -acodec copy out.dv


30 августа 2011, 15:30 от Tim Nicholson <tim.nicholson at bbc.co.uk>:
 
  
  
Is it reasonable that :-
"ffmpeg -i SYNCTEST.mov -vcodec copy -acodec copy out.dv"

fails with:-

[..]
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'SYNCTEST.mov':
   Metadata:
     major_brand : qt
     minor_version : 537199360
     compatible_brands: qt
     creation_time : 2006-09-15 18:15:58
   Duration: 00:02:00.00, start: 0.000000, bitrate: 30336 kb/s
     Stream #0.0(eng): Video: dvvideo (dvcp / 0x70637664), yuv420p, 
720x576 [SAR 16:15 DAR 4:3], 28800 kb/s, 25 fps, 25 tbr, 25k tbn, 25 tbc
     Metadata:
       creation_time : 2006-09-15 18:15:59
     Stream #0.1(eng): Audio: pcm_s16be (twos / 0x736F7774), 48000 Hz, 2 
channels, s16, 1536 kb/s
     Metadata:
       creation_time : 2006-09-15 18:15:59
[dv @ 0x12a1f80] Can't initialize DV format!
Make sure that you supply exactly two streams: 
 
 

      video: 25fps or 29.97fps, audio: 2ch/48kHz/PCM 
 
 

      (50Mbps allows an optional second audio stream)
[...]

which is a tad unhelpful since exactly two streams have been supplied of 
a compatible format...

but:-
"ffmpeg -i SYNCTEST.mov -target dv out.dv"

works fine with:-

[...]
Assuming PAL for target.
File '/mnt/pserver/avidnet/out.dv' already exists. Overwrite ? [y/N] y
[buffer @ 0x12a1ec0] w:720 h:576 pixfmt:yuv420p tb:1/1000000 sar:16/15 
sws_param:
Output #0, dv, to '/mnt/pserver/avidnet/out.dv':
   Metadata:
     major_brand : qt
     minor_version : 537199360
     compatible_brands: qt
     creation_time : 2006-09-15 18:15:58
     encoder : Lavf53.10.0
     Stream #0.0(eng): Video: dvvideo, yuv420p, 720x576 [SAR 16:15 DAR 
4:3], q=2-31, 200 kb/s, 90k tbn, 25 tbc
     Metadata:
       creation_time : 2006-09-15 18:15:59
     Stream #0.1(eng): Audio: pcm_s16le, 48000 Hz, 2 channels, s16, 1536 
kb/s
     Metadata:
       creation_time : 2006-09-15 18:15:59
Stream mapping:
   Stream #0.0 -> #0.0: dvvideo -> dvvideo
   Stream #0.1 -> #0.1: pcm_s16be -> pcm_s16le
[...]


...but I wonder if it has actually done an unnecessary recode....

-- 
Tim

http://www.bbc.co.uk/
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