[FFmpeg-devel] [PATCH] seeking in asf files where audio stream is found before video
Sun Jul 8 00:00:10 CEST 2007
Currently asf demuxer reads the index provided in the file on first seek and
adds it to the stream that the seek occured in. Any seeks on other streams
in the file will then not use the provided index.
This turns out to be an issue since av_find_stream_info will seek to pts 0
for all available streams, if audio is found first, then index get's loaded
on the audio stream. When a seek is tried later, the default stream seeked
is the video stream wich doesn't have an index loaded.
If an asf stream doesn't have a index, it defaults to binary seek, wich will
then add some index points to the stream, on the next seek those will be
used without interpolation.
This patch changes the demuxer to only load index for the video stream, and
fall back to the general seeks in utils.c if its internal seek doesn't work.
Sadly seem to be a bug in av_gen_search, wich happens to search the whole
damn file when av_find_stream_info tries to seeks to pts 0, so there is also
a hack in this patch to handle seeks to time 0.
On another note, shouldn't the demuxer set AVFormatContext->data_offset
instead of just setting data_offset in ASFContext? If so i can provide a
patch for that.
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