[mythtv-users] Downscale HD recordings with ffmpeg

belcampo belcampo at zonnet.nl
Tue Mar 24 21:18:44 UTC 2009


kanetse at gmail.com wrote:
> On Wed, Mar 18, 2009 at 5:40 PM, belcampo <belcampo at zonnet.nl> wrote:
>> I've once had this too, but current ffmpeg SVN does it right, at least for
>> me. I use version:
>> FFmpeg version SVN-r17735, Copyright (c) 2000-2009 Fabrice Bellard, et al.
>>  configuration: --prefix=/usr --enable-libx264 --enable-libxvid --enable-gpl
>> --enable-libfaac --enable-libmp3lame --enable-pthreads --disable-ffserver
>> --enable-libfaad --enable-ffplay --disable-vhook
>>  libavutil     49.15. 0 / 49.15. 0
>>  libavcodec    52.20. 0 / 52.20. 0
>>  libavformat   52.31. 0 / 52.31. 0
>>  libavdevice   52. 1. 0 / 52. 1. 0
>>  built on Mar  2 2009 19:12:25, gcc: 4.2.2 20071128 (prerelease)
>> (4.2.2-3.1mdv2008.0)
>>
> 
> I tried to compile it from SVN on Mythbuntu, following the
> instructions here:
> http://www.webhostingtalk.com/showthread.php?p=4234345#post4234345 but
> it seems to segfault immediately upon starting encoding.
> 
> FFmpeg version SVN-r18178, Copyright (c) 2000-2009 Fabrice Bellard, et al.
>   configuration: --enable-shared --enable-libxvid --enable-libvorbis
> --enable-libmp3lame --enable-gpl --enable-libfaad --enable-libfaac
> --enable-libx264
How about removing --enable-shared, an update by some other package, or 
different versions in usr/lib and /usr/local/lib might get you in trouble.
>   libavutil     50. 2. 0 / 50. 2. 0
>   libavcodec    52.22. 3 / 52.22. 3
>   libavformat   52.32. 0 / 52.32. 0
>   libavdevice   52. 1. 0 / 52. 1. 0
>   libswscale     0. 7. 1 /  0. 7. 1
>   built on Mar 24 2009 11:34:05, gcc: 4.3.2
> 
> Seems stream 0 codec frame rate differs from container frame rate:
> 59.94 (60000/1001) -> 29.97 (30000/1001)
> Input #0, mpegts, from '/data/mythtv/store/3229_20090318205900.mpg':
>   Duration: 00:36:00.04, start: 46931.763644, bitrate: 12773 kb/s
>   Program 1
>     Stream #0.0[0x7c0]: Video: mpeg2video, yuv420p, 1920x1080 [PAR 1:1
> DAR 16:9], 80000 kb/s, 29.97 tbr, 90k tbn, 59.94 tbc
80000 kb/s, I don't know for sure but this looks rather high to me.
>     Stream #0.1[0x7c1](eng): Audio: ac3, 48000 Hz, stereo, s16, 384 kb/s
> File 'result.ts' already exists. Overwrite ? [y/N] y
> Segmentation fault
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