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DVB-T2 Recordings: Sometimes no Audio after muxing with mkvmerge
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<blockquote data-quote="bta489" data-source="post: 1267571" data-attributes="member: 138471"><p>Hi there,</p><p></p><p>I have a strange problem with mkvmerge when processing some recordings from german DVB-T2. </p><p></p><p>So what's happening:</p><p>I record a show on my HTPC. I access the recordings from a different PC to Remux it to MKV, remove unwanted tracks and cut off the beginning and the end with mkvmerge. This usually works fine for me. However on some recordings the remuxed file will not play any audio or won't play at all (it stays on the start frame). The Raw recorded .ts-file plays without problems. </p><p></p><p>When I just remux a problematic file (keep all tracks, no edits whatsoever), the beginning will play fine up to the program announcements, when the sound cuts out, and the video continues silently. Sometimes the sound returns for the next program at the end of the recording. This appears to be limited to recordings from DasErste/ARD and related channels.</p><p></p><p>When comparing the MediaInfo of both files there are some differences in Bitrate and Codec-ID:</p><p>The Raw recording:</p><p>[CODE]Audio #1</p><p>ID : 64 (0x40)</p><p>Menu ID : 137 (0x89)</p><p>Format : AAC LC</p><p>Format/Info : Advanced Audio Codec Low Complexity</p><p>Muxing mode : LATM</p><p>Codec ID : 17-2</p><p>Duration : 41 min 53 s</p><p>Bit rate mode : Variable</p><p>Maximum bit rate : 262 kb/s</p><p>Channel(s) : 6 channels</p><p>Channel layout : C L R Ls Rs LFE</p><p>Sampling rate : 48.0 kHz</p><p>Frame rate : 46.875 FPS (1024 SPF)</p><p>Compression mode : Lossy</p><p>Delay relative to video : -873 ms</p><p>Language : German[/CODE]</p><p></p><p>The edited MKV: </p><p>[CODE]Audio</p><p>ID : 2</p><p>Format : AAC LC</p><p>Format/Info : Advanced Audio Codec Low Complexity</p><p>Codec ID : A_AAC-2</p><p>Duration : 25 min 56 s</p><p>Bit rate : 124 kb/s</p><p>Channel(s) : 6 channels</p><p>Channel layout : C L R Ls Rs LFE</p><p>Sampling rate : 48.0 kHz</p><p>Frame rate : 46.875 FPS (1024 SPF)</p><p>Compression mode : Lossy</p><p>Delay relative to video : 15 ms</p><p>Stream size : 23.0 MiB (5%)</p><p>Language : German</p><p>Default : Yes</p><p>Forced : No[/CODE]</p><p></p><p>Has anyone encountered a similar problem or even has a fix?</p></blockquote><p></p>
[QUOTE="bta489, post: 1267571, member: 138471"] Hi there, I have a strange problem with mkvmerge when processing some recordings from german DVB-T2. So what's happening: I record a show on my HTPC. I access the recordings from a different PC to Remux it to MKV, remove unwanted tracks and cut off the beginning and the end with mkvmerge. This usually works fine for me. However on some recordings the remuxed file will not play any audio or won't play at all (it stays on the start frame). The Raw recorded .ts-file plays without problems. When I just remux a problematic file (keep all tracks, no edits whatsoever), the beginning will play fine up to the program announcements, when the sound cuts out, and the video continues silently. Sometimes the sound returns for the next program at the end of the recording. This appears to be limited to recordings from DasErste/ARD and related channels. When comparing the MediaInfo of both files there are some differences in Bitrate and Codec-ID: The Raw recording: [CODE]Audio #1 ID : 64 (0x40) Menu ID : 137 (0x89) Format : AAC LC Format/Info : Advanced Audio Codec Low Complexity Muxing mode : LATM Codec ID : 17-2 Duration : 41 min 53 s Bit rate mode : Variable Maximum bit rate : 262 kb/s Channel(s) : 6 channels Channel layout : C L R Ls Rs LFE Sampling rate : 48.0 kHz Frame rate : 46.875 FPS (1024 SPF) Compression mode : Lossy Delay relative to video : -873 ms Language : German[/CODE] The edited MKV: [CODE]Audio ID : 2 Format : AAC LC Format/Info : Advanced Audio Codec Low Complexity Codec ID : A_AAC-2 Duration : 25 min 56 s Bit rate : 124 kb/s Channel(s) : 6 channels Channel layout : C L R Ls Rs LFE Sampling rate : 48.0 kHz Frame rate : 46.875 FPS (1024 SPF) Compression mode : Lossy Delay relative to video : 15 ms Stream size : 23.0 MiB (5%) Language : German Default : Yes Forced : No[/CODE] Has anyone encountered a similar problem or even has a fix? [/QUOTE]
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