New submission from Kevin Vance <[email protected]>:
I am trying to generate MPEG-4 video that is compatible with the latest
QuickTime player. When I use a low frame rate, the output is playable
on MPlayer but green and artifacty on QuickTime. With the same input
but a higher frame rate, QuickTime can play it. The cutoff seems to be
17 fps; anything lower than that is unplayable.
8 FPS video generation:
ffmpeg -v 9 -loglevel 99 -f image2 -r 8 -i '%08d.png' -vb 800k -f mp4 -
vcodec mpeg4 'low_fps_mpeg4.mp4'
FFmpeg version SVN-r25859, Copyright (c) 2000-2010 the FFmpeg developers
built on Dec 1 2010 10:40:50 with gcc 4.4.5
configuration: --prefix=/home/kvance/ffmpeg
libavutil 50.33. 0 / 50.33. 0
libavcore 0.14. 0 / 0.14. 0
libavcodec 52.97. 2 / 52.97. 2
libavformat 52.87. 1 / 52.87. 1
libavdevice 52. 2. 2 / 52. 2. 2
libavfilter 1.66. 0 / 1.66. 0
libswscale 0.12. 0 / 0.12. 0
[image2 @ 0x193b510] Probe buffer size limit 5000000 reached
Input #0, image2, from '%08d.png':
Duration: 00:00:57.62, start: 0.000000, bitrate: N/A
Stream #0.0, 41, 1/8: Video: png, rgb24, 480x320, 1/8, 8 fps, 8 tbr,
8 tbn, 8 tbc
[buffer @ 0x1947ec0] w:480 h:320 pixfmt:rgb24
[ffsink @ 0x1948130] auto-inserting filter 'auto-inserted scaler 0'
between the filter 'src' and the filter 'out'
[scale @ 0x1948450] w:480 h:320 fmt:rgb24 -> w:480 h:320 fmt:yuv420p
flags:0xa0000004
Output #0, mp4, to 'low_fps_mpeg4.mp4':
Metadata:
encoder : Lavf52.87.1
Stream #0.0, 0, 1/8: Video: mpeg4, yuv420p, 480x320, 1/8, q=2-31,
800 kb/s, 8 tbn, 8 tbc
Stream mapping:
Stream #0.0 -> #0.0
Press [q] to stop encoding
frame= 461 fps=129 q=2.0 Lsize= 3372kB time=57.62 bitrate=
479.4kbits/s
video:3368kB audio:0kB global headers:0kB muxing overhead 0.133390%
24 FPS video generation:
ffmpeg -v 9 -loglevel 99 -f image2 -r 24 -i '%08d.png' -vb 800k -f mp4 -
vcodec mpeg4 'high_fps_mpeg4.mp4'
FFmpeg version SVN-r25859, Copyright (c) 2000-2010 the FFmpeg developers
built on Dec 1 2010 10:40:50 with gcc 4.4.5
configuration: --prefix=/home/kvance/ffmpeg
libavutil 50.33. 0 / 50.33. 0
libavcore 0.14. 0 / 0.14. 0
libavcodec 52.97. 2 / 52.97. 2
libavformat 52.87. 1 / 52.87. 1
libavdevice 52. 2. 2 / 52. 2. 2
libavfilter 1.66. 0 / 1.66. 0
libswscale 0.12. 0 / 0.12. 0
[image2 @ 0x26ff510] Probe buffer size limit 5000000 reached
Input #0, image2, from '%08d.png':
Duration: 00:00:19.20, start: 0.000000, bitrate: N/A
Stream #0.0, 41, 1/24: Video: png, rgb24, 480x320, 1/24, 24 fps, 24
tbr, 24 tbn, 24 tbc
[buffer @ 0x270bec0] w:480 h:320 pixfmt:rgb24
[ffsink @ 0x270c130] auto-inserting filter 'auto-inserted scaler 0'
between the filter 'src' and the filter 'out'
[scale @ 0x270c450] w:480 h:320 fmt:rgb24 -> w:480 h:320 fmt:yuv420p
flags:0xa0000004
Output #0, mp4, to 'high_fps_mpeg4.mp4':
Metadata:
encoder : Lavf52.87.1
Stream #0.0, 0, 1/24: Video: mpeg4, yuv420p, 480x320, 1/24, q=2-31,
800 kb/s, 24 tbn, 24 tbc
Stream mapping:
Stream #0.0 -> #0.0
Press [q] to stop encoding
frame= 461 fps=132 q=2.6 Lsize= 2134kB time=19.21 bitrate=
910.0kbits/s
video:2129kB audio:0kB global headers:0kB muxing overhead 0.210967%
----------
messages: 12746
priority: normal
status: new
substatus: new
title: Low framerate MPEG-4 video unplayable on QuickTime
type: bug
________________________________________________
FFmpeg issue tracker <[email protected]>
<https://roundup.ffmpeg.org/issue2397>
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