Compressing the recorded HD broadcasts for storage

Forums › Freeview (DVB-T/DVB-S) › Compressing the recorded HD broadcasts for storage - anybody done this?

lchiu7

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#24755 1-Aug-2008 18:02

The TV3 HD broadcasts with AC-3 audio are running about 3.3G/42 minutes of show. There are some I wouldn't mind keeping but 3.3G each takes up a lot of space. Many of the US TV shows in HD are appearing online at about 1G for a 720P H.264/ac3 audio file. I was wondering if anybody here has had any luck compressing their captures to something smaller for longer term storage without much loss of quality.

Thanks

Larry

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#153489 2-Aug-2008 06:01

I can't find anything that can load a TS file for transcoding. I use GPVR. A solution would be nice.

lchiu7

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#153491 2-Aug-2008 06:57

I have the tools - just that I can't always (usually ) get a file back that has audio/video in sync.

High level

1. get hold of x264.exe
2. the avisynth script is something simple like

Directshowsource("name.ts")
converttoyv12()
LanczosResize(1280,720)

Compress the video using x264

3. Demux audio using dgavcindex

4. Mux it back using Tsmuxer

My audio is always always out of sync and worse, it could start in sync and slowly go out. I think it could be my DVB-T USB device since Tsmuxer often says there is unrecognised AC3 data in the stream - dropped. When watching the recorded shows I occasionally get static in the audio (guessing that is the unrecognised AC3 data and therefore a tuner issue perhaps?) so the program ditches that data.

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TinyTim

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#153990 4-Aug-2008 12:29

Try MediaCoder (http://mediacoder.sourceforge.net/). I've used it to convert Fossie's HD samples to DivX (*), but you can convert to anything, and set whatever compression you like, as well as plenty of other options.

(*) I only got it to work with the progressive samples, not the interlaced samples. But I'm not entirely convinced that's the fault of MediaCoder.

lchiu7

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#154075 4-Aug-2008 18:11

TinyTim:
Try MediaCoder (http://mediacoder.sourceforge.net/). I've used it to convert Fossie's HD samples to DivX (*), but you can convert to anything, and set whatever compression you like, as well as plenty of other options.

(*) I only got it to work with the progressive samples, not the interlaced samples. But I'm not entirely convinced that's the fault of MediaCoder.

Downloading and trying tonight. Alas if it doesn't work with the interlaced samples (TV3) then I am still SOL :-(

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TinyTim

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#154257 5-Aug-2008 11:40

How did it go? The problems I had may have been codec issues.

lchiu7

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#154272 5-Aug-2008 12:24

No joy - it just came up saying no output file! I didn't spend too much time on it

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TinyTim

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#154348 5-Aug-2008 15:08

I'm no video expert, and it took me a while to figure out the combinations of video format, audio format and containers that worked. Now I just stick with what I know.

Tradepub

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hellonearthisman

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#154390 5-Aug-2008 17:14

lchiu7: No joy - it just came up saying no output file! I didn't spend too much time on it

Me too, no luck. watch a tutorial and still didn't help. will try again.

TinyTim

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#154469 5-Aug-2008 21:25

I have the same problem if I try to encode as H.264. On the Audio tab I chose 'copy audio' and on the Video tab I chose 'Copy Video'. I chose the AVI container, and then the MP4 container. This gave me the same error (not sure what the error is though).

But using this preset seems to be working: Extensions > other devices > x264 setup. (Still not for the interlaced samples though.)

kiwistag

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#156019 11-Aug-2008 20:47

Try MCEBuddy - it also has the addin to remove ads, scheduling, etc. So far it seems to be doing well for me (Only using DVB-S here though) and am encoding using HDTV DivX encoding - the $20 odd for the full DivX set was worth it in the long run.

flewy

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#156041 11-Aug-2008 21:09

Have ya tried StaxRip http://www.planetdvb.net/staxrip/ found it absolutly brilliant for my PVR-150 to compress from MPEG2 to x264 or xvid.

flewy

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#156070 11-Aug-2008 21:49

ok staxrip works for TS files. reduced that tv1 202MB sample to 67MB @1280x720

flewy

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#156095 11-Aug-2008 22:21

ok i may have jumped the gun , no audio

hellonearthisman

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#156218 12-Aug-2008 10:48

StaxRip looks nice, Ill have a play with it tonight.

I did get mediacoder to work also.

eXDee

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#156443 12-Aug-2008 22:36

Apparently meGUI should handle it well, but screw downloading and configuring all those programs and going through all those steps to transcode a single ts file.
If anyone has the time: http://mewiki.project357.com/wiki/MeGUI/HDTV_Transcoding_Guide

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