Originally Posted by bazfletch3
Im using Mediaportal for my PVR functionality (very happily!) and am starting to build up quite a stack of recordings that i want to keep long term.
I'm looking to start working through them all (they are currently .TS files) and editing them to remove the "lead-in/lead out" buffering as well as any commercial breaks...
I've been recording HDTV via OTA, in the .ts format just like you. Been recording over the last 6 years or so, and yes, without processing those files, you need a lot of hard disk drives for storage.
Like other posters before me, I think that VideoRedo is the best editor for mpeg2 based .ts files. Other solutions may offer basic cut-and-join functionality, but VRD has a couple things going for it that (AFAIK
) the other programs do not.
(1) VRD can make cuts within a GOP, so you can edit on *any* frame, not just on I-frames... this is very important if you need to maintain 3:2 cadence for film-based sources that can be inverse-telecined later, since the cadence will be changing within the raw .ts file during the program, between commercial breaks.
(2) VRD will automatically fix issues in the A/V stream, for example, correcting input sequence errors, or dropping video or audio frames to maintain A/V sync. Not all recordings land on your hard disk 100% error free, you see
(3) VRD can display an audio graph in the editing timeline, enabling you to see things like A/V sync issues (you can add a +/- offset to the audio relative to video to correct sync problems), or when the broadcast changes from 2-channel audio to 5.1 channels, via color coding.
and then re-encode them into a file format which is easier to deal with.
If you collect a lot of programs, you may want to hold off on re-encoding. Editing by itself takes a bit of time... particularly if it is done meticulously with consistent 3:2 cadence in mind (so IVTC can be done later). When the editing is done, and all commercials and lead-in/lead-out buffering is removed, you have most likely reduced your space requirement for your edited recording by 25-35%, relative to the raw .ts file. Re-encoding with more compression can reduce your space requirement further, but it is additional work, and re-encoding HD can take a looooong time.
For me, editing is sufficient. Here is an example of how editing alone is a good compromise for reducing the space requirement of a 1-hour recording without having to re-encode.
A 1-hour + 4 minutes raw file (1 hour with 2 minutes of start/end padding) of a network prime-time drama. The raw recording yields a 8.2GB .ts file (1080i + 5.1 audio)
After editing out the commercials and the start/end padding, this typically gets reduced to around 5.2GB. The example here is for a recording with the highest bitrate I've seen in a local HD broadcast (appx. 16.5Mbps).
Other recordings will have lower bitrates (I've seen 8Mbps for 720p ATSC broadcast sources), and these lower bitrate recordings can be as low as 2.7GB for a 1-hour program, after editing.
So you would re-encode only if you really need to reduce your raw .ts filesize by >65-75% per "hour". Not worth the additional work IMHO... but I would seriously enjoy reading about it if you happen to find a re-encode solution that works out for you and that you are totally satisfied with. I've subscribed to this thread, just in case you do