[mythtv-users] Suggested Encoding Rates
Jason McLeod
anakin at sdf1.net
Thu Apr 28 18:53:18 UTC 2005
I found some video guys here at work, who know a few things about
video encoding.
They where telling me that the NTSC standard is 720x480, although
cable broadcasts don't use that high, it's much closer to 480x320. I
originally had my resolution for capturing set to the max, but I'll
try scaling it down to the true broadcast size, that should save some
space.
Since I'm using a very weak box to run the Myth backend on, I'd
rather have the size determined while the card is encoding with the
hardware MPEG2 encoder.
-Jason
Blog: http://jason.sdf1.net
GPG Fingerprint:
anakin at sdf1.net - A6CC 40B4 99A4 1C08 55A7 BCFC ECDF ED68 115E 5993
On 28-Apr-05, at 1:35 PM, Timothy Daniel Hamer wrote:
> On Thu, 28 Apr 2005, Scott Alfter wrote:
>
>
>> Neil Bird wrote:
>>
>>> I was just about to post this and a related question. I'm
>>> running my
>>> PVR-350 with fairly high (normally) res. PAL settings, and a
>>> bitrate of
>>> ~6200 somethings. I get images of ~2.0-2.2 Gb per hour.
>>>
>>> Now, I just downloaded [bittorrent] an episode of something I
>>> missed.
>>> The AVI's ~364 Mb for the, I guess, ~43 mins., but is, whem played
>>> through MythVideo, of comparable quality to the stuff I record at
>>> 6x the
>>> size!
>>>
>>
>> Those AVIs you downloaded probably aren't using MPEG-2, but
>> instead use some
>> variant or another of MPEG-4. That's why they can deliver the
>> same quality in
>> less space. Comparing MPEG-4 to MPEG-2 is like comparing Ogg
>> Vorbis to MP3.
>>
>> You could transcode from MPEG-2 to MPEG-4 (MythTV will even do
>> this for you),
>> but the transcoded recordings won't be playable through your
>> PVR-350. (That
>> assumes you're using its MPEG-2 decoder; I stopped using mine when
>> I upgraded
>> to an LCD TV and switched from S-video to DVI.)
>>
>> _/_
>> / v \ Scott Alfter (remove the obvious to send mail)
>> (IIGS( http://alfter.us/ Top-posting!
>> \_^_/ rm -rf /bin/laden >What's the most annoying thing
>> on Usenet?
>>
>>
>
> I noticed the same thing with downloaded files vs. files captured
> from my pvr 150, but even when i use mythtranscode to convert them
> to mpeg-4, i can get downloaded AVI files that look much better and
> are smaller. Should i use one of the external transcoding programs
> instead of mythtranscode?
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