[mythtv-users] Transcoding HD-PVR Recordings
Nick Rout
nick.rout at gmail.com
Mon Sep 20 21:10:34 UTC 2010
On Tue, Sep 21, 2010 at 7:39 AM, Doug Vaughan <r.d.vaughan at rogers.com>wrote:
> John and Kirk,
> I regularly edit and transcode HDPVR recordings. There are some
> restrictions which may not suit you but here is what I do.
>
> 1) I locked my STB to 1280x720p output. This keeps the recording size down
> but allows me to reliably use a video editor.
> 2) I use a compiled version of Avidemux 2.4 as I found at least the Ubuntu
> packaged version could not handle the audio AC3 tracks. Avidemux has not
> worked for me with 1920x1080i HDPVR recordings. I have reliably edited up to
> 8Gb files if the 1280x720p restriction is adheared to. Although I rarely
> record more than 6Gb HDPVR file.
> 3) I edit the HDPVR recording as needed then save as an avi with copy audio
> and copy video settings.
> 4) I run a ffmpeg copying the audio and video tracks to change the
> container from avi to mkv. This also sets a seek table that reliably works
> with the MythTV internal player.
> 5) If you want to transcode the mkv file use HandBrake either the GUI or
> the CLI. I have several presets for various sizes of transcoded video.
> Handbrake already has iPod presets that you can use. I transcode the output
> to mkv files. If you want to use the cli then you can cut and paste their
> iPod presets from the GUI. That was my starting point when building my
> customized presets.
> 6) Occasionally the audio can be out of sync which I correct with a feature
> of MKV File Creator GUI. MKV File Creator will not accept the HDPVR
> recordings directly you need to at least change their container type with a
> ffmpeg copy.
>
> As I can write python and bash scripts, outside of the manual editing or
> audio resync, the whole process has been automated. I even initiate the
> process as a right click script in Nautilus. The transcoding occurs as an
> overnight cron job.
>
> This would not be what everyone would want but has worked well for my needs
> almost two years now.
>
Doug, do you use avidemux interactively or via scripting? It should be
easyish (for someone with a bit of knowledge) to extract the cutpoints from
the database and insert them into an avidemux control file, then run
avidemux-cli.Is this what you do?
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