[mythtv-users] Transcode UK Terrestrial HD content.‏

[Rob Sones]

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> Date: Sun, 3 Jun 2012 17:37:05 +0100
> From: anothersname at googlemail.com
> To: mythtv-users at mythtv.org
> Subject: Re: [mythtv-users] Transcode UK Terrestrial HD content.‏
>
> ..............trimmed
> >
> >> > Have you tried to play the saved HD files using either mplayer, ffmpeg
> >> > or VLC
> >> > What do you get?
> >
> > Yes the recordings play with mplayer, ffmpeg and vlc.
> >
> > From ffplay
> > Input #0, mpegts, from '1050_20120601160000.mpg':
> >   Duration: 00:04:58.10, start: 32082.077733, bit rate: 7985 kb/s
> >   Program 1
> >     Stream #0:0[0x19c9]: Video: h264 (High) ([27][0][0][0] / 0x001B),
> > yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 40.61 fps, 50 tbr, 90k tbn, 50 tbc
> >     Stream #0:1[0x19ca](eng): Audio: aac_latm ([17][0][0][0] / 0x0011),
> > 48000 Hz, stereo, s16
> >     Stream #0:2[0x19ce](eng): Audio: aac_latm ([17][0][0][0] / 0x0011),
> > 48000 Hz, stereo, s16 (visual impaired)
> >     Stream #0:3[0x19cd](eng): Subtitle: dvb_subtitle ([6][0][0][0] / 0x0006)
> >     Stream #0:4[0x19fa]: Unknown: none ([5][0][0][0] / 0x0005)
> >     Stream #0:5[0x19d2]: Unknown: none ([11][0][0][0] / 0x000B)
> >     Stream #0:6[0x6f]: Unknown: none ([11][0][0][0] / 0x000B)
> >
> > If it helps I can provide outputs from everything else and perhaps mediainfo
> > ?
> >
>
> I wasn't aware that DVB-T2 was transmitting audio in an AAC format,
> DVB-S still transmits as either AC3 or MP3. As I'm still running .23
> fixes could someone confirm that the later versions of transcode
> handle AAC?
>
> I, like some others, ended up writing my own scripts to transcode
> BBC/ITV HD as I wanted to transcode into 720P while still retaining
> AC3 if it was presented (although ITV seem to have not found the AC3
> button yet). The reason to retain AC3 was I use an external amp with
> AC3 that is connected via an optical SPDIF cable, I think some newer
> amps now support AAC surround(?) but it seemed silly to upgrade when
> everything else was working fine.
>
> If this homebrew script is of any use for your own testing let me know
> and I'll happily let you have a copy.
>
> The ITV transcodes are admittedly a bit 'cludgy' as the script looks
> for the nearest keyframe to where you marked for the cut and makes the
> cut there, this is due to my lack of experience with handling H264
> streams as I couldn't see a way to make the file cut on an exact frame
> so instead my script chops the target file up into 'retained' segments
> and then process's them before recombining them into a mkv container.
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That's very kind of you, yes please. I will see if I can make use of them.Thank you for taking the time to respond to my queries.
Rob