[mythtv-users] Status of ffmpeg 4.4.1

[John Pilkington]

On 03/11/2021 20:22, John Pilkington wrote:
> On 03/11/2021 19:26, Peter Bennett wrote:
>> Most things are working with ffmpeg 4.4.1 in the devel/ffmpeg-resync 
>> branch
>>
>> What is not working:
>>
>> - Audio "upconvert stereo to 5.1 sound" when playing a video with 
>> stereo sound - error message and no audio playback .
>>
>> - Speedup / slowdown when playing a video with dolby 5.1 audio - error 
>> message and no audio playback .
>>
>> - Report from John Pilkington that an existing bug with edit markers 
>> and step lengths now reacts slightly differently - I don't know if it 
>> is better or worse with the new ffmpeg.
>>
>> I am looking into the 5.1 audio issues.
>>
>> Peter
> 
> Hi Peter.  Thanks for your work on this.  It looks to me as if the 
> resync is fine and the difference that I reported is a difference 
> between the two ffmpeg versions.
> 
> I added another comment to issue 344 on finding that the cutlist editor 
> problem with H.264 recordings goes away if I first process the file, 
> without cuts, into the ffmpeg format that also worked with leanfront.  I 
> don't know if that happens because of the non-AV streams that get 
> removed, or because of the many complaints that ffprobe makes about the 
> structure of the beginning of the raw recording file.
> 
> https://github.com/MythTV/mythtv/issues/344
> 
> I haven't noticed any problems in skipping during playback of the 
> processed file.
> 
> I don't often make H.264 recordings, but I have another one scheduled to 
> see how well I can internal cuts these days.

Recording made, non-AV streams removed, and the cuts seemed fine.  That 
was with mythffmpeg 2-core decoding.  Skipping OK.  Going to NVDEC 
decoding gives a brief pixellated shimmer on skipping.  I tried HQ and 
MQ deinterlace; they looked similar.  GT710 and 470 driver.
> 
> Thanks again,
> 
> John