#7847: Mkv customIO wrong cluster
-------------------------------------+-------------------------------------
Reporter: lunatichai | Type: defect
Status: new | Priority: normal
Component: avformat | Version: git-
Keywords: mkv cluster | master
avio_alloc_context | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
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Summary of the bug: when transcode mkv->webm with custom write with
"avio_alloc_context" the result file is different from default avio.
I found that the difference is in MATROSKA_ID_CLUSTER. In customIO bytes:
1F 43 B6 75 01 FF FF FF FF FF FF FF E7. In default avio (for example): 1F
43 B6 75 01 00 00 00 00 06 32 D8 E7.
My simple code to create io:
{{{
uint8_t *avio_ctx_buffer = nullptr;
const size_t avio_ctx_buffer_size = 4096;
avio_ctx_buffer = (uint8_t*)av_malloc(avio_ctx_buffer_size);
if (!avio_ctx_buffer) return;
bufferData = new BufferData();
avio_ctx = avio_alloc_context(avio_ctx_buffer,
avio_ctx_buffer_size,
1, bufferData, NULL,
&write_packet_to_buffer, NULL);
}}}
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Ticket URL: <https://trac.ffmpeg.org/ticket/7847>
FFmpeg <https://ffmpeg.org>
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