[mythtv-users] Transcoding issues. SD is fine, HD fails

[Neil Salstrom]

On Wed, Apr 14, 2010 at 7:44 AM, belcampo <belcampo at zonnet.nl> wrote:
> Neil Salstrom wrote:
>>
>> On Wed, Apr 14, 2010 at 12:19 AM, belcampo <belcampo at zonnet.nl> wrote:
>>
>>> The problem probably is in the misdetection of fields vs. frames. I guess
>>> it's 50interlaced fields, which is 25fps.
>>> If fields are interpreted as frames you get the slow-motion effect.
>>> I issued 1456 1457 1472 on the ffmpeg 'bug' list.
>>> Depending on the container mp4 mkv or mpeg-ts you probably can circumvent
>>> the situation by defining 50fps in the container, play at double-speed.
>>
>> This is with ATSC and not PAL.  The original files are 1080i_30, 720p_60.
>
> I'm almost sure that forcing to fps 60 will solve your problems.
> ffmpeg -i transcoded-file.ext will tell you what ffmpeg thinks what ist the
> right speed.
>
> mediainfo -f transcoded-file.ext will probably tell you that video duration
> is twice the audio-length.
>>
>> I also tried playback without VDPAU and it behaves the same so it does
>> not seem to be playback related but rather how it was transcoded.
>
> It reads the info from transcoded-file.ext if that's wrong, because of the
> wrong transcoding, so will playback be wrong.

If I'm reading this correctly, you are right...