[FFmpeg-user] ffmpeg mp4 encoding with cfr is not working

[Sangsu Baek]

This is my ffmpeg-1.2.1 configuration log.
Thank you.

./configure --enable-cross-compile --cross-prefix=/home/ssbaek/lbsp/trunk/build/../build/toolchain/bin/arm-none-linux-gnueabi- --arch=arm --cc=/home/ssbaek/lbsp/trunk/build/../build/toolchain/bin/arm-none-linux-gnueabi-gcc --disable-mmx --target-os=linux --enable-small --sysinclude=/home/ssbaek/lbsp/trunk/build/../build/toolchain/arm-none-linux-gnueabi/libc/usr/include --disable-debug --disable-filters --disable-bsfs --disable-outdevs --disable-parsers --disable-muxers --disable-demuxers --extra-ldflags=-L/home/ssbaek/lbsp/trunk/build/../build/toolchain/arm-none-linux-gnueai/lib --disable-encoders --enable-encoder=mpeg4 --disable-network --disable-decoders --enable-decoder=yuv4 --disable-static --enable-shared --prefix=./output --disable-doc --enable-decoder=h264 --extra-cflags=-I/home/ssbaek/lbsp/trunk/build/../build/toolchain/arm-none-linux-gnueabi/libc/usr/include --enable-decoder=rawvideo --enable-encoder=libx264 --enable-encoder=libx264rgb --enable-gpl --enable-muxer=mp4 --enable-filter=scale --enable-filter=fps --enable-demuxer=rawvideo --enable-encoder=yuv4 --enable-encoder=rawvideo --enable-muxer=rawvideo



On Jun 19, 2013, at 5:53 PM, Sangsu Baek <sangsu.baek at gmail.com> wrote:

> Below is console output:
> 
> /tmp # ffmpeg -f v4l2 -input_format yuyv422 -r 15 -s 320x240 -i /dev/video0 -t 30 -y -vcodec mpeg4 -filter:v fps=15  /tmp/record.mp4
> ffmpeg version 1.2.1 Copyright (c) 2000-2013 the FFmpeg developers
>  built on Jun 19 2013 15:18:50 with gcc 4.5.2 (Sourcery G++ Lite 2011.03-41)
>  configuration: --enable-cross-compile --cross-prefix=/home/ssbaek/lbsp/trunk/build/../build/toolchain/bin/arm-none-linux-gnueabi- --arch=arm --cc=/home/ssbaek/lbsp/trunk/build/../build/toolchain/bin/arm-none-linux-gnueabi-gcc --disable-mmx --target-os=linux --enable-small --sysinclude=/home/ssbaek/lbsp/trunk/build/../build/toolchain/arm-none-linux-gnueabi/libc/usr/include --disable-debug --disable-filters --disable-bsfs --disable-outdevs --disable-parsers --disable-muxers --disable-demuxers --extra-ldflags=-L/home/ssbaek/lbsp/trunk/build/../build/toolchain/arm-none-linux-gnueai/lib --disable-encoders --enable-encoder=mpeg4 --disable-network --disable-decoders --enable-decoder=yuv4 --disable-static --enable-shared --prefix=./output --disable-doc --enable-decoder=h264 --extra-cflags=-I/home/ssbaek/lbsp/trunk/build/../build/toolchain/arm-none-linux-gnueabi/libc/usr/include --enable-decoder=rawvideo --enable-encoder=libx264 --enable-encoder=libx264rgb --enable-gpl --enable-muxer=mp4 --enable-filter=scale --ena  libavutil      52. 18.100 / 52. 18.100
>  libavcodec     54. 92.100 / 54. 92.100
>  libavformat    54. 63.104 / 54. 63.104
>  libavdevice    54.  3.103 / 54.  3.103
>  libavfilter     3. 42.103 /  3. 42.103
>  libswscale      2.  2.100 /  2.  2.100
>  libswresample   0. 17.102 /  0. 17.102
>  libpostproc    52.  2.100 / 52.  2.100
> [video4linux2,v4l2 @ 0x46550] Estimating duration from bitrate, this may be inaccurate
> Input #0, video4linux2,v4l2, from '/dev/video0':
>  Duration: N/A, start: 0.000000, bitrate: 18432 kb/s
>    Stream #0:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 320x240, 18432 kb/s, 15 fps, 15 tbr, 1000k tbn, 1000k tbc
> transcode_init:s:ost->frame_rate.num = [15]
> Output #0, mp4, to '/tmp/record.mp4':
>  Metadata:
>    encoder         : Lavf54.63.104
>    Stream #0:0: Video: mpeg4 ( [0][0][0] / 0x0020), yuv420p, 320x240, q=2-31, 200 kb/s, 15360 tbn, 15 tbc
> Stream mapping:
>  Stream #0:0 -> #0:0 (rawvideo -> mpeg4)
> Press [q] to stop, [?] for help
> frame=  194 fps= 17 q=5.3 Lsize=     401kB time=00:00:12.93 bitrate= 254.0kbits/s    
> video:399kB audio:0kB subtitle:0 global headers:0kB muxing overhead 0.405465%
> Received signal 2: terminating.
> 
> Thank you.
> 
> On Jun 19, 2013, at 5:26 PM, Carl Eugen Hoyos <cehoyos at ag.or.at> wrote:
> 
>> Sangsu Baek <sangsu.baek <at> gmail.com> writes:
>> 
>>> ffmpeg -f v4l2 -input_format yuyv422 -r 15 -s 320x240 
>>> -i /dev/video0 -t 30 -y -vcodec mpeg4 -filter:v
>>> fps=15  /tmp/record.mp4
>> 
>> Complete, uncut console output missing, the video filter 
>> looks superfluous.
>> 
>>> Problem is output fps is varying.
>> 
>> That is surprising because FFmpeg's mp4 muxer only 
>> supports cfr.
>> 
>> Carl Eugen
>> 
>> _______________________________________________
>> ffmpeg-user mailing list
>> ffmpeg-user at ffmpeg.org
>> http://ffmpeg.org/mailman/listinfo/ffmpeg-user
>