stuart wrote:
>
>
> Roger Heflin wrote:
>
>> The script does attempt to determine the bitrate, and stream types
>> of the original file and only adjust as much as necessary, If the
>> bitrate is above 10 it cuts it down, if the resolution is above 640x480
>> it cuts that down, and it adjusts the bitrate (up or down) based on
>> the resolution reduction/increate being done.
>>
>> The ones that I have transcoded appear to work correctly on the mvpmc,
>> on the things that are original SD mpeg/ac3 streams it coverts the AC3
>> to mp3 and leaves the video as it was originally encoded, the resulting
>> mp3 audio appears to be in sync, at least so far I have not noticed
>> it being out of sync.
>>
>> Roger
>
> I finally got around to running the script on a file in the mythbackend
> collection of recordings. The file started out as a OTA ATSC HDTV
> recording with AC3 2.1 sound. It ended up as a recording that can play
> back on the MVPMC with mpeg stereo. I think the AC3 was wiped out as
> the MVPMC digital output is only stereo 48KHz.
>
> However, I couldn't get the sound and video on the MVPMC to sync up. It
> appeared to be somewhere between a second and a faction of a second off.
> After jumping around it looked better, but never right on. I played
> back the same recording with mythfrontend and the recording and audio
> were synchronized from the get go and jumping around didn't change that.
>
> So, that's confusing. The video is now playable and clearly has an mpeg
> stereo audio attached. I would have guessed the transcoded audio and
> video were not in sync with each other if it were not for the perfectly
> synchronized playback using the mythfrontend.
>
> So, what's the difference between this transcoded recording and a
> recording off my OTA NTSC tuner (which plays back perfectly on my MVPMC
> box)?
>
Something I noted in the past.
I did not always have audio sync issues, I started having the sync
issues when I changed the MythTV bitrate, before that
everything appeared to work correctly. After changing the bitrate the
audio tended to be out of sync some of the time even though testing
with mythfrontend and mplayer showed that the audio was perfectly
in sync.
This has gotten alot better with the new mvpmc version, but it appears
to me that bitrate has some bearing on the audio being in sync or not.
U would expect the ATSC OTA SD stuff to have a much higher bitrate then
most of your recordings.
Roger
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