[mythtv-users] How to improve 720p playback (1080i ok)?
taylor.ralph at gmail.com
Sat Dec 4 20:20:39 UTC 2010
On Sat, Dec 4, 2010 at 3:13 PM, Jerry Rubinow <jerrymr at gmail.com> wrote:
> On Fri, Dec 3, 2010 at 8:45 AM, Jerry Rubinow <jerrymr at gmail.com> wrote:
>> On Fri, Dec 3, 2010 at 2:28 AM, Raymond Wagner <raymond at wagnerrp.com>
>>> On 12/3/2010 00:34, Jerry Rubinow wrote:
>>>> With more investigation, I've found mpeg 480p, 720p and 1080i all play
>>>> back ok. It is H264 720p which does not. Any ideas what to look into?
>>> 720p60 means these are HDPVR recordings? What bitrate do you have it set
>> Yes. The mpeg recordings are all HDHomerun, and the H264 720p60 is from
>> the HDPVR. It's set to whatever the default is - I've never changed it.
>> I'll try changing the bitrate and see what happens. I do observe though
>> that the CPU hovers in the low 30 percent range when playing back. So I
>> don't understand the reason for the pauses, if it's caused by too high a
> I lowered the bitrate down to 2000 in the profile and recorded a show, but
> it still has the same problem.
> To reiterate, 720p H264 recordings from the HDPVR exhibit pauses during
> playback. The log shows that frames are repeatedy being dropped because the
> audio is ahead of the video. I have no problem with 720p or 1080i mpeg
> files from the HDHomeRun. Playback is under mythfrontend compiled on a
> Window box with ION video. CPU usage during playback is low (around the low
> 30s percent). Lower than with the mpeg playback.
> I tried forcing the NVideo vsync setting off, didn't help. Tried different
> recording bitrates, as mentioned, didn't help. Playback is configured to
> use Direct3D / ffmpeg.
> Can someone fill in any details about how mpeg decode differs from H264
> decode in myth?
It would be much more helpful if you posted a log with the video in
question playing with the -v playback,timestamp options.
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