[mythtv-users] ffmpeg errors

Nick Rout nick.rout at gmail.com
Mon Apr 25 09:15:01 UTC 2011

On Mon, Apr 25, 2011 at 10:56 AM, Matt Harrison
<iwasinnamuknow at genestate.com> wrote:
> On 24/04/2011 22:23, Nick Morrott wrote:
>> On 24 April 2011 21:20, Matt Harrison<iwasinnamuknow at genestate.com>  wrote:
>>> On 24/04/2011 21:12, Nick Morrott wrote:
>>>> On 24 April 2011 20:41, Matt Harrison<iwasinnamuknow at genestate.com>    wrote:
>>>>> Has anyone got any ideas what I can do to get these files into shape? I can
>>>>> supply the options for my final encode to x264 if necessary.
>>>> Run the recordings through ProjectX before editing/re-encoding. I do
>>>> this for _all_ DVB-T/S recordings, just in case.
>>>> Cheers,
>>>> Nick
>>> Thanks I'll take a look at that now.
>> Depending on the tools you're using for editing/transcoding (and to
>> remove extraneous audio tracks) you may want to first demux the
>> transport stream into its constituent streams, and then remux into a
>> new MPEG2-PS file containing a single M2V video stream and single MP2
>> audio track.
>> Some tools prefer demuxed streams, others work just as well with a
>> (fixed) remuxed stream. The current avidemux release can produce
>> unsynced audio when using separate audio and video streams - when
>> using this tool for lossless editing I use a remuxed file.
>> Cheers,
>> Nick
> I'm currently using ffmpeg to directly re-encode from the PS. I've
> wirrten a little ruby script that works out how many audio and subtitle
> tracks there are and makes sure they get properly re-encoded in the new
> file. It works like a dream with most files but not these.
> I've tried Project-X and demuxed the tracks (only 1 video, 1 audio) in
> the current program. Once they're demuxed, ffmpeg doesn't seem to have a
> problem with them. There's still the occasional warning message, but it
> seems to output a perfectly functioning file now. Thanks for that :)

Project X can spit a lot of errors and still fix them :)

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