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mpegts: Try seeking back even for nonseekable protocols
The mpegts demuxer reads 5 KB at startup just for discovering the packet size. Since the default avio buffer size is 32 KB, the seek back to the start will in most cases be within the avio buffer, and will in most cases succeed even if the actual protocol isn't seekable. This makes the demuxer startup faster/with less data when reading data from a non-seekable input, by not skipping the first few KB. If it fails, don't warn if the protocol isn't seekable, making it behave as before in the failure case. Signed-off-by: Martin Storsjö <martin@martin.st>
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@ -1899,7 +1899,7 @@ static int mpegts_read_header(AVFormatContext *s)
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/* normal demux */
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/* first do a scan to get all the services */
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if (pb->seekable && avio_seek(pb, pos, SEEK_SET) < 0)
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if (avio_seek(pb, pos, SEEK_SET) < 0 && pb->seekable)
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av_log(s, AV_LOG_ERROR, "Unable to seek back to the start\n");
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mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1);
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