#9241: probing incomplete with flvs containing subtitles and data
-------------------------------------+-------------------------------------
Reporter: j0sh | Type: defect
Status: new | Priority: normal
Component: | Version:
undetermined | unspecified
Keywords: | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
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Summary of the bug:
If a FLV is detected as having a subtitle stream AND data stream, probing
prematurely stops on the 3rd stream without waiting for additional
streams. This usually means detecting audio, but missing video.
This can often happen when encoders introduce leading audio before video,
or if pulling from a RTMP server that sends audio immediately but
withholds video until the next keyframe (we don't necessarily want to
trust metadata here).
For example, the attached representative file `flv-probe-missing-
streams.flv` has some extraneous metadata along with an audio and video
track. But only the audio is detected.
How to reproduce:
{{{
% ffprobe flv-probe-missing-streams.flv
...
Input #0, flv, from 'flv-probe-missing-streams.flv':
Duration: 00:00:09.98, start: 0.000000, bitrate: 273 kb/s
Stream #0:0: Data: none
Stream #0:1: Subtitle: text
Stream #0:2: Audio: aac (LC), 44100 Hz, mono, fltp
}}}
Here is a patch fixing this:
https://patchwork.ffmpeg.org/project/ffmpeg/patch/1620949077-2936-1-git-
[email protected]/
ffprobe output after the patch:
{{{
% ffprobe flv-probe-missing-streams.flv
...
Input #0, flv, from 'flv-probe-missing-streams.flv':
Duration: 00:00:09.98, start: 0.000000, bitrate: 273 kb/s
Stream #0:0: Data: none
Stream #0:1: Subtitle: text
Stream #0:2: Audio: aac (LC), 44100 Hz, mono, fltp
Stream #0:3: Video: h264 (High), yuv420p(tv, progressive), 320x240
[SAR 1:1 DAR 4:3], 25 fps, 25 tbr, 1k tbn
}}}
--
Ticket URL: <https://trac.ffmpeg.org/ticket/9241>
FFmpeg <https://ffmpeg.org>
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