[Libav-user] Erratic encoding issue: Crazy framerates.

[Paul B Mahol]

Dana 3. 9. 2015. 10:23 osoba "Talgorn François-Xavier" <
fxtalgorn-at-yahoo.fr at ffmpeg.org> napisala je:
>
> Hi all,
>
> Thank you in advance for your help.
> I wrote a program that takes videos as input (H264), process filters on
it and encode a modified video in MP4 (simple profile).
> Everything works fine but the fact that some videos are encoded with
crazy frame rates, like 2500 or 24000 fps.
> I assume the problem is related to the way I manage timestamps. I tried
tens of workarounds to no avail.
> Here is the resulting infos of both an example that fails and another
that is OK.
>
> Any help would be a relief. Thanks!
>
> ----------------------------
> AN EXAMPLE THAT FAILS
> ----------------------------
> H264 ORIGINAL VIDEO
> Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'MS-EPI.mp4':
>   Metadata:
>     major_brand     : mp42
>     minor_version   : 1
>     compatible_brands: mp42mp41
>     creation_time   : 2014-02-06 23:02:05
>   Duration: 00:01:12.44, start: 0.000000, bitrate: 7175 kb/s
>     Stream #0:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv,
bt709), 960x540, 7041 kb/s, 25 fps, 25 tbr, 2500 tbn, 5k tbc (default)
>     Metadata:
>       creation_time   : 2014-02-06 23:02:05
>       handler_name    : Module de gestion vid?o
>     Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz,
stereo, fltp, 127 kb/s (default)
>     Metadata:
>       creation_time   : 2014-02-06 23:02:05
>       handler_name    : Module de gestion sonore
>
>
> FAILED RESULTING ENCODED VIDEO (2501.39 fps)
> Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '_MS_MS-EPI.mp4':
>   Metadata:
>     major_brand     : isom
>     minor_version   : 512
>     compatible_brands: isomiso2mp41
>     encoder         : Lavf56.15.102
>   Duration: 00:01:12.45, start: 0.000000, bitrate: 453 kb/s
>     Stream #0:0(und): Video: mpeg4 (Simple Profile) (mp4v / 0x7634706D),
yuv420p, 960x540 [SAR 1:1 DAR 16:9], 32430 kb/s, 2501.39 fps, 2500 tbr, 10k
tbn, 2500 tbc (default)
>     Metadata:
>       handler_name    : VideoHandler
>     Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz,
stereo, fltp, 127 kb/s (default)
>     Metadata:
>       handler_name    : SoundHandler
>
> -----------------------------
> AN EXAMPLE THAT WORKS
> -----------------------------
> ORIGINAL H264 VIDEO
> Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'Coco.mp4':
>   Metadata:
>     major_brand     : mp42
>     minor_version   : 0
>     compatible_brands: isommp42
>     creation_time   : 2015-05-31 07:54:08
>   Duration: 00:00:15.00, start: 0.000000, bitrate: 352 kb/s
>     Stream #0:0(und): Video: h264 (Constrained Baseline) (avc1 /
0x31637661), yuv420p, 640x360 [SAR 1:1 DAR 16:9], 252 kb/s, 25 fps, 25 tbr,
25 tbn, 50 tbc (default)
>     Metadata:
>       handler_name    : VideoHandler
>     Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz,
stereo, fltp, 96 kb/s (default)
>     Metadata:
>       creation_time   : 2015-05-31 07:54:08
>       handler_name    : IsoMedia File Produced by Google, 5-11-2011
>
> CORRECT RESULTING ENCODED VIDEO
> Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '_Coco.mp4':=    0B f=0/0
>   Metadata:
>     major_brand     : isom
>     minor_version   : 512
>     compatible_brands: isomiso2mp41
>     encoder         : Lavf56.15.102
>   Duration: 00:00:15.00, start: 0.000000, bitrate: 893 kb/s
>     Stream #0:0(und): Video: mpeg4 (Simple Profile) (mp4v / 0x7634706D),
yuv420p, 640x360 [SAR 1:1 DAR 16:9], 811 kb/s, 25 fps, 25 tbr, 12800 tbn,
25 tbc (default)
>     Metadata:
>       handler_name    : VideoHandler
>     Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz,
stereo, fltp, 96 kb/s (default)
>     Metadata:
>       handler_name    : SoundHandler
>    1.81 A-V: -0.004 fd=   0 aq=    6KB vq=   37KB sq=    0B f=0/0
>

What filtering you used?
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