[mythtv] ffmpeg and mythtranscode

[John P Poet]

I thought we *had* agreed to drop support for non-hardware recorders after
29?

On Mon, Dec 4, 2017 at 5:49 PM Jean-Yves Avenard <jyavenard at gmail.com>
wrote:

> Mythtranscode can do more than nuppel or mjpeg,
>
> I would have loved to drop all those weird formats, but you still have
> users with nuv recorders. That thing never dies.
>
> On Mon, 4 Dec 2017 at 10:07 pm, Peter Bennett <pb.mythtv at gmail.com> wrote:
>
>> In my project of updating the deprecated ffmpeg calls, I got to
>> "avcodec_encode_video2", which is the function that passes frames to
>> ffmpeg for encoding. It is replaced by avcodec_send_frame and
>> avcodec_receive_packet.
>>
>> It seems the main use of video encoding is for mythtranscode. It is also
>> used for nuppelvideo recording.
>>
>> I have never used mythtranscode, commercial scan or the editing features.
>>
>> I tested transcode without my changes. I selected the highest resolution
>> it would allow in the setup (720x480), and selected mpeg-4 (there are
>> only 2 options, mjpeg and mpeg-4). I ran it on a 1.0 GB 1080i (mpeg2)
>> file and it produced a 1.5 GB 1920x1080 nuppelvideo H263 file. This
>> seems less than useful and I question whether it is still used or
>> needed. Selecting mjpeg produced a 2.7 GB file, even less useful.
>>
>> With my changes, transcoding to mpeg-4 produced a 1.5 GB unplayable
>> file, with no error message during transcode but huge numbers of errors
>> during failed playback.
>>
>> I checked the code and it seems to be calling everything correctly.
>>
>> At this point I am leaving the deprecated avcodec_encode_video2 in
>> place. Maybe the entire transcode process should be deprecated, or maybe
>> it should be fixed so it is useful and actually produce a smaller file
>> than the original. H264 would be a better choice.
>>
>> Peter
>>
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