[FFmpeg-user] fps in March 13 git: -r 29.97 = 2997 tbn ???
leo.izen at gmail.com
Sat Apr 2 21:51:42 CEST 2011
On Sat, Apr 2, 2011 at 3:28 PM, sean darcy <seandarcy2 at gmail.com> wrote:
> On 04/02/2011 07:50 AM, Mike Scheutzow wrote:
>> sean darcy wrote:
>>> Converting to an android playable file, I can't seem to set the fps.
>>> The input is 29.97. I tried setting -r to 29.97:
>>> Output #0, ipod, to 'OUTPUT1.m4v':
>>> encoder : Lavf52.102.0
>>> Stream #0.0: Video: libx264, yuv420p, 720x480 [PAR 8:9 DAR 4:3],
>>> q=0-69, pass 1, 10000 kb/s, 30k tbn, 29.97 tbc
>>> tbn is the framerate for the AVStream of the container, as I gather
>>> from google. It seems that -r affects tbn of the output. But really
>>> How do I set fps of the output?
>> You misunderstand the meaning of tbn. tbn is not the "framerate" of the
>> container, it is the timebase.
>> A timebase is like a clock, and indicates ticks per second. Generally,
>> higher values are better.
>> Both values of tbn you saw should work fine for your file. You got
>> different values because 29.97 is not *exactly* equal to 30000/1001.
>> Also, be careful believing the tbn / tbc "Output #0" stats - they have
>> been broken for months. Use 'ffmpeg -i infile' to get accurate values.
>> Mike Scheutzow
> Maybe more accurate, but much more confusing:
> Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'OUTPUT1.m4v':
> major_brand : M4V
> minor_version : 512
> compatible_brands: isomiso2avc1
> creation_time : 2011-04-02 03:00:26
> encoder : Lavf52.102.0
> Duration: 00:05:44.34, start: 0.000000, bitrate: 9920 kb/s
> Stream #0.0(und): Video: h264 (High), yuv420p, 720x480 [PAR 8:9 DAR
> 4:3], 9916 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 59.94 tbc
> This is not interlaced, why 59.94? And tbn, whatever it is, is 30,000???
Here's one where none of the numbers match:
Input #0, mpeg, from 'IndianaJones3.vob':
Duration: 02:06:52.96, start: 1.000000, bitrate: 6245 kb/s
Stream #0.0[0x1e0]: Video: mpeg2video (Main), yuv420p, 720x480 [PAR
32:27 DAR 16:9], 9800 kb/s, 23.98 fps, 29.97 tbr, 90k tbn, 59.94 tbc
Stream #0.1[0x80]: Audio: ac3, 48000 Hz, 5.1, s16, 448 kb/s
> ffmpeg-user mailing list
> ffmpeg-user at ffmpeg.org
More information about the ffmpeg-user