Hi Peter, On Mon, Nov 30, 2015 at 00:09:41 +0100, Peter B. wrote: > - In some players (e.g. VLC) audio plays fine at the beginning, but is > mute when the actual program starts.
Indeed. At the same time, mplayer and ffplay play it fine. > - It "seems" that the audio samplerate changes mid-stream between 48kHz > and 44.1kHz. vlc says: [00007f84acefb7b8] packetizer_mpeg4audio packetizer: AAC channels: 1 samplerate: 24000 > - Remuxing to MKV fails with the error message: > "Could not write header for output file #0 (incorrect codec parameters ?): > Invalid argument" > (Commandline and complete, uncut console output below: (1)) Actually, the issue is > [matroska @ 0x3844e60] Error parsing AAC extradata, unable to determine > samplerate. I don't know why this causes an issue. I believe a change was introduced to ffmpeg to avoid creating "illegal" Matroska files. On the other hand, I can remux your file to MP4 and that to Matroska, and that works fine, i.e. ffmpeg doesn't complain. VLC still won't play the sound though. > - Re-encoding audio to "pcm_s16le" fails: > [quote] > [aac @ 0x2258720] channel element 2.0 is not allocated > Error while decoding stream #0:1: Invalid data found when processing > input > [aac @ 0x2258720] element type mismatch 1 != 0 > [/quote] It doesn't actually "fail". Did you even have a look at the output file? I (and so do you) get a complete file, which includes 30 seconds of video and audio, and VLC plays the sound just fine now. Same if I recode audio to something else such as AAC (using libfdk_aac). So I believe ffmpeg's audio decoder handles your file fine, while VLC has some issues. > How could this MPEG-TS file be normalized in a way that the video is > kept as-is, but the audio is e.g. resampled to a common rate, in order > to play fine on all players? I think you were on the right track, and failed to see that the second file actually works. ;-) Moritz _______________________________________________ ffmpeg-user mailing list [email protected] http://ffmpeg.org/mailman/listinfo/ffmpeg-user
