[FFmpeg-devel] [PATCH v2] ffmpeg: add per-stream input option drop_changed

[Gyan Doshi]

On 2025-03-16 11:39 pm, Gyan Doshi wrote:
>
>
> On 2025-03-16 11:12 pm, James Almer wrote:
>> On 3/16/2025 4:18 AM, Gyan Doshi wrote:
>>> This is a replacement in ffmpeg for the deprecated avcodec flag 
>>> AV_CODEC_FLAG_DROPCHANGED.
>>>
>>> This option is meant to be used when the filtergraph should not be
>>> reinited upon input parameter changes as that leads to loss of state
>>> in the filtergraph potentially leading to broken or aborted output,
>>> e.g. inserting of silence with first_pts specified in aresample.
>>>
>>> Generally useful to avoid corrupted yet decodable packets in live
>>> streaming inputs.
>>>
>>> This option when enabled takes precedence over reinit_filters
>>
>> How does this differ from simply setting reinit_filter to false, if 
>> what you want is the filtergraph to not be reinitialized?
>
> av_buffersrc_add_frame_flags will return an error for all audio frames 
> with differing parameters, as no filters are yet capable of handling 
> them. ultimately leading to program exit.
> Same is true for video frames barring a handful of filters like scale 
> or idet ..etc

Plan to push tomorrow.

Regards,
Gyan