[mythtv-users] Downscale HD recordings with ffmpeg

[belcampo]

kanetse at gmail.com wrote:
> On Mon, Mar 16, 2009 at 3:13 AM, belcampo <belcampo at zonnet.nl> wrote:
>> My goal is "visibly the same quality" and "light on file-size".
>>
>> I use this:
>>
>> ffmpeg -i source.mpg -vcodec libx264 -b 2772k -flags +loop -coder 1 -refs 2
>> -deblockalpha 0 -deblockbeta 0 -partitions +parti4x4 -partitions +partp8x8
>> -partitions +partb8x8 -partitions +parti8x8 -me_method umh -subq 7 -me_range
>> 24 -cmp +chroma -bf 0 -b_strategy 1 -g 250 -keyint_min 25 -sc_threshold 40
>> -maxrate 4500k -r 25 -qmin 16 -qmax 32 -s 896x720 -aspect 16:9 -acodec
>> libfaac -ab 192k -ar 48000 -ac 6 -f mpegts result.ts
>>
>> ffmpeg doesn't produce 100% mpegts files, they don't play on an PopCornHour
>> STB, I have to remux with tsMuxeR to get it 100%.
>>
> 
> I've been following this thread, it has been extremely useful as I am
> looking for a way to perform x264 encodings.  When I tried the command
> above on one of my recordings, the audio was extremely low pitched
> (although it was appeared to be at the right speed).  It was basically
> inaudable.  Also periodically, the video seems to pause for minutes at
> a time.  This is on a 1080i recorded program.
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)


> 
> Any ideas on what I might have done wrong?
> 
> Thanks!
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