BBC HD: Difference between revisions
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'''BBC HD on Astra 28. |
'''BBC HD on Astra 28.2e''' |
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Sky Digital HDTV Standards are a little different to the norm. You may encounter problems getting BBC HD working with MPlayer or other Linux media players. |
Sky Digital HDTV Standards are a little different to the norm. You may encounter problems getting BBC HD working with MPlayer or other Linux media players. |
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When using |
When using '''scan''' to create '''channels.conf''', the correct video PID is not selected by default. Using a video PID of 0 will not work as it does on non-HD channels and can cause errors such as "NO VIDEO!" or "Video: no video" in MPlayer. Here is the current working '''channels.conf''' entry (updated 25 August 2008): |
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BBC HD:10847:v:0:22000:2328:2329:6940 |
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or, more explicitly |
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As you can see the correct video PID is 2318. 2319 is the Dolby Digital (AC3) PID, choose 2320 if you want MP2 Layer 3 (Mp3). |
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frequency = 10847 MHz V, symbolrate = 22000, vpid = 0x0918 (decimal 2328), |
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apid = 0x0919 (decimal 2329), sid = 0x1b1c (decimal 6940) |
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An alternative apid is 2330. |
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The way in which the H.264 codec is defined in the TS stream is non-standard and a patch is required for mplayer: |
The way in which the H.264 codec is defined in the TS stream is non-standard and a patch is required for mplayer: |
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[UPDATE 25th Aug 2008: is this still true??? Mplayer works fine for me without patching.] |
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<pre> |
<pre> |
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On slower CPUs, very slow MPlayer playback of BBC HD can be fixed with the command-line option <tt>-lavdopts skiploopfilter=all</tt>. Also possibly add <tt>:threads=N</tt> option for multi-core CPUs. |
On slower CPUs, very slow MPlayer playback of BBC HD can be fixed with the command-line option <tt>-lavdopts skiploopfilter=all</tt>. Also possibly add <tt>:threads=N</tt> option for multi-core CPUs. |
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[[Kaffeine]] plays BBC HD, see that page for more details. |
[[Kaffeine]] scans, tunes and plays BBC HD without modification, see that page for more details. |
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Revision as of 16:51, 25 August 2008
BBC HD on Astra 28.2e
Sky Digital HDTV Standards are a little different to the norm. You may encounter problems getting BBC HD working with MPlayer or other Linux media players.
When using scan to create channels.conf, the correct video PID is not selected by default. Using a video PID of 0 will not work as it does on non-HD channels and can cause errors such as "NO VIDEO!" or "Video: no video" in MPlayer. Here is the current working channels.conf entry (updated 25 August 2008):
BBC HD:10847:v:0:22000:2328:2329:6940
or, more explicitly
frequency = 10847 MHz V, symbolrate = 22000, vpid = 0x0918 (decimal 2328), apid = 0x0919 (decimal 2329), sid = 0x1b1c (decimal 6940)
An alternative apid is 2330.
The way in which the H.264 codec is defined in the TS stream is non-standard and a patch is required for mplayer:
[UPDATE 25th Aug 2008: is this still true??? Mplayer works fine for me without patching.]
--- mplayer/libmpdemux/video.c.ark 2007-02-25 15:31:54.000000000 +0100
+++ mplayer/libmpdemux/video.c 2007-02-25 15:39:20.000000000 +0100
@@ -81,6 +81,7 @@
video_codec = VIDEO_OTHER;
// Determine image properties:
+scan_video:
switch(video_codec){
case VIDEO_OTHER: {
if((d_video->demuxer->file_format == DEMUXER_TYPE_ASF) || (d_video->demuxer->file_format == DEMUXER_TYPE_AVI)) {
@@ -250,6 +251,13 @@
while(1){
int i=sync_video_packet(d_video);
if(i==0x1B3) break; // found it!
+ else if((i&~0x60) == 0x107 && i != 0x107) {
+ // Some H.264 HDTV stations, including e.g. ProSieben HD as of
+ // 2007/02/25, are misidentified as MPEG-2. This is probably what
+ // we're seeing here, let's try to fix it.
+ video_codec=VIDEO_H264;
+ goto scan_video;
+ }
if(!i || !skip_video_packet(d_video)){
if( mp_msg_test(MSGT_DECVIDEO,MSGL_V) ) mp_msg(MSGT_DECVIDEO,MSGL_V,"NONE :(\n");
mp_msg(MSGT_DECVIDEO,MSGL_ERR,MSGTR_MpegNoSequHdr);
Special thanks to Bernhard Rosenkraenzer for this patch, it hasn't been accepted into the main MPlayer source tree as the maintainers do not want to support wrongly produced TS streams. The same problem exists on ProSieben HD in Germany and the above patch fixes that too.
On slower CPUs, very slow MPlayer playback of BBC HD can be fixed with the command-line option -lavdopts skiploopfilter=all. Also possibly add :threads=N option for multi-core CPUs.
Kaffeine scans, tunes and plays BBC HD without modification, see that page for more details.