H264 Recordings Freesat UK BBC4 HD

Hansol123

Member
View attachment VRD.txt


In the UK BBC4HD is now broadcast on Freeview and Freesat but in my are only on Freesat.

I normally record BBC H264 programs from Freeview using NPVR and cut using VRD but restricted to using Freesat for BBC4HD (NPVR and a Hauppauge PCI DVB S2 card)

I have been in correspondence over the last week with the helpful support desk at Conceiva regarding problems streaming BBC4HD Freesat recordings to my Sony Bravia TV using Mezzmo.

The symptoms are that the picture runs really slowly lagging behind the sound and then jumps to catchup.

Conceiva have tweaked the Sony profile this week but the symptoms continue. I discovered last night that I can stream the uncut file to the TV without any problems ,thus the problem appears to occur after editing in VRD. I also note that after removing just 2 minutes from the start of the recording the file shrinks from 2,500,128KB to 1,517,874KB.

I have attached a file showing the FFmpeg data (using the Mezzmo utility) after and then before the edit.

Thanks for your assistance.

Maurice
 

Dan203

Senior Developer
Staff member
Do me a favor, open the before file in MediaInfo, switch to text view, then copy/paste the info here. I want to see if there is anything specific about the file that might be causing the issue.
 

Hansol123

Member
File: Name : E:\Recorded TV\Ever Decreasing Circles_20140116_20002030.ts
Size : 2.560 GB
Duration : 00:35:45.24
Mux type : TS Stream
TS mux rate : 9.727 Mbps
Video: Encoding : H.264
VideoStreamID : x14B4
Frame rate : 25.00 fps
Encoding size : 1920 x 1080
Aspect ratio : 16:9
Header bit rate : 20.000 Mbps
VBV buffer : 380 KBytes
Profile : High/4.0
Progressive : Interlaced
Chroma : 4:2:0
Entropy mode : CABAC
Bit rate : 8.736 Mbps
Audio Stream: 1 (Primary) Codec : AC3
Format : AC3 stream
Channels : 2.0
Language : eng
PID : x14B5
PES Stream Id : xBD
Bit rate : 192 Kbps
Sampling rate : 48000
Sample size : 16 bits
Audio Stream: 2 Codec : MPEG
MPEGLayer : Layer 2
Channels : 2.0
Language : NAR
PID : x14B6
PES Stream Id : xC0
Bit rate : 256 Kbps
Sampling rate : 48000
Sample size : 16 bits
Subtitle: 1-1 Type : DVB Teletext
PID : 0x14B7
Language : eng
Page : 888
Subtitle: 1-2 Type : DVB Teletext
PID : 0x14B7
Language : eng
Page : 888
Subtitle: 2-1 Type : DVB Subpic
PID : 0x14B8
Language : eng
Page : 1
 

Hansol123

Member
Another example

File: Name : C:\Recordings wip\The Bridge\The Bridge_20140118_21002200.ts
Size : 3.745 GB
Duration : 01:05:45.15
Mux type : TS Stream
TS mux rate : 8.998 Mbps
Video: Encoding : H.264
VideoStreamID : x14B4
Frame rate : 25.00 fps
Encoding size : 1920 x 1080
Aspect ratio : 16:9
Header bit rate : 20.000 Mbps
VBV buffer : 380 KBytes
Profile : High/4.0
Progressive : Interlaced
Chroma : 4:2:0
Entropy mode : CABAC
Bit rate : 6.860 Mbps
Audio Stream: 1 (Primary) Codec : AC3
Format : AC3 stream
Channels : 2.0
Language : eng
PID : x14B5
PES Stream Id : xBD
Bit rate : 192 Kbps
Sampling rate : 48000
Sample size : 16 bits
Audio Stream: 2 Codec : MPEG
MPEGLayer : Layer 2
Channels : 2.0
Language : NAR
PID : x14B6
PES Stream Id : xC0
Bit rate : 256 Kbps
Sampling rate : 48000
Sample size : 16 bits
Subtitle: 1-1 Type : DVB Teletext
PID : 0x14B7
Language : eng
Page : 888
Subtitle: 1-2 Type : DVB Teletext
PID : 0x14B7
Language : eng
Page : 888
Subtitle: 2-1 Type : DVB Subpic
PID : 0x14B8
Language : eng
Page : 1
 

Dan203

Senior Developer
Staff member
Hmmm... Try this... When saving the file click the Options button in the Save dialog. Then click Advanced. In the TS options section set the Mux Rate to manual and set it to 10.0 then uncheck the option that says Omit NULL packets. That'll create a file with a constant mux rate, which may be what your player needs. Although if it is your files may end up being quite a bit bigger then they would have been without those options set.
 

Hansol123

Member
Thanks Dan

Tried your settings but picture still runs very slowly and then catches up with sound and runs slow again.

H264 programs recorded from Freeview terrestrial work fine, obviously something different about the Freesat satellite files

Maurice
 

Hansol123

Member
Hi

This problem still persists.

In summary uncut files recorded from UK Freesat stream without any problem to my Sony Bravia smart TV, as do all VRD edited HD and SD recordings from UK Freeview.

As soon as I edit a Freesat recording using VRD the picture runs very slowly and then jumps when streamed to the TV.

I conclude that the edited Freesat files must contain or lack some code needed by the tv.

Any help would be appreciated.

Maurice
 

Dan203

Senior Developer
Staff member
Do they play like this in any PC based software? Something I can use to test? I don't have a Sony TV and without the ability to test this myself there isn't much I can do.
 

Hansol123

Member
Thanks Dan

The files play ok using VLC Windows Media player and NPVR not sure what other Windows programs I can try.


Maurice
 

Dan203

Senior Developer
Staff member
Sounds like a problem with the Sony TV. Does it support any other formats? Have you tried MP4 or MKV instead?
 

Hansol123

Member
Set does not play MKV, so saved as MP4 ,plays first few seconds at normal speed and then stops and starts.
Thanks Dan

As stated above non edited Freesat files play without any problems, therefore TV must be allergic to something in the edited version.

Edited Freeview HD files play without any problems.

Perhaps it is time to give up !!

Maurice
 

Dan203

Senior Developer
Staff member
Does it only stall at the edit points? Or does it stall throughout the video. If it'a stalling at the edit points then it could be a problem with the SPS/PPS. Our encoder isn't capable of matching every H.264 encoding parameter in existence. So it's possible there is a minor difference in the SPS/PPS right around the edit points. If that's what you're seeing there is nothing we can do. However if it,s pausing more frequently then that's weird. Because other then the edit points the video is pass through as is. If it was a muxer issue then it's highly unlikely it would effect both TS and MP4 files as they use completely different muxers.
 

Hansol123

Member
Hi Dan

I only cut at the beginning and near the end of the file as BBC4 is advert free.

It stalls from the beginning of the cut file.

I will record a program tonight and try fast forwarding a few minutes and let you know the result.

Maurice
 

Hansol123

Member
Unfortunately unable to fast forward therefore exited and then resumed from the exit point but the slow picture continued.
 

Dan203

Senior Developer
Staff member
Try this... Don't make any edits at all, just open the file and save it. Does it still play weird? That will tell us if the editing or the muxing is causing the issue.
 

Hansol123

Member
Try this... Don't make any edits at all, just open the file and save it. Does it still play weird? That will tell us if the editing or the muxing is causing the issue.
Saved without any cuts and symptoms continued as before.

Regards

Maurice
 

BDGillard

New member
bbc hd surround sound glitch

Don’t know whether this could be relevant, but there are currently problems with BBC HD surround sound transmissions. See http://www.bbc.co.uk/reception/news/news_item23.html
I have recently experienced problems with the surround sound from bbc 4hd, the audio switches from surround to stereo for a few frames, and then reverts back to surround sound. VRD does not show any errors and the glitch only becomes apparent when playing the video with MPC or videolan when the audio mutes at the glitch and does not return, problem solved by editing out the glitch in vdr
 
Top Bottom