[mythtv] ffmpeg and mythtranscode

[Jean-Yves Avenard]

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
>
> _______________________________________________
> mythtv-dev mailing list
> mythtv-dev at mythtv.org
> http://lists.mythtv.org/mailman/listinfo/mythtv-dev
> http://wiki.mythtv.org/Mailing_List_etiquette
> MythTV Forums: https://forum.mythtv.org
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.mythtv.org/pipermail/mythtv-dev/attachments/20171205/4e88334d/attachment.html>