[vlc-devel] Detect for A/V Sample Delayed

[Lad, Prabhakar]

On Tue, Dec 12, 2017 at 2:54 PM, Rémi Denis-Courmont <remi at remlab.net> wrote:
> Le 12 décembre 2017 16:51:29 GMT+02:00, "Lad, Prabhakar" <prabhakar.csengg at gmail.com> a écrit :
>>Hi Remi,
>>
>>Thanks for the quick reply.
>>
>>On Tue, Dec 12, 2017 at 2:28 PM, Rémi Denis-Courmont <remi at remlab.net>
>>wrote:
>>> Hello,
>>>
>>> It depends what you actually mean by delay and how you measure it.
>>
>>Something like the below log, when I enable the vlc messages:
>>core warning: picture is too late to be displayed (missing 1455 ms)
>>avcodec debug: enabling direct rendering
>>avcodec warning: plane 0 not aligned
>>avcodec warning: disabling direct rendering
>>core warning: picture is too late to be displayed (missing 1446 ms)
>>core warning: picture is too late to be displayed (missing 1434 ms)
>>core warning: playback too early (-62177): down-sampling
>>avcodec debug: enabling direct rendering.
>>
>>And also similarly for the audio:
>>playback way too early (-122000): playing silence
>>
>>I want to detect them from the vlc application, without looking at the
>>video so to save some time.
>>Is there any api that I could use to parse them mp4 and detect for such
>>flaws ?
>>
>>Cheers,
>>--Prabhakar Lad
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>
> Those messages are computed from render and decoder. They intrinsically require decoding and rendering.

This means it cannot be detected until and unless the video is played,
so there isn’t much I could do rather than going through the video manually.

Cheers,
--Prabhakar Lad