[FFmpeg-devel] [PATCH 4/7] avcodec/encode: add support for param change frame side data

[James Almer]

On 1/27/2025 9:48 AM, Andreas Rheinhardt wrote:
> James Almer:
>> With this, callers can signal supported encoders to reinitialize using certain
>> parameters, which should allow for more graceful (but potentially more limited
>> in scope) reinitialization than closing and reopening the encoder, or even
>> simply on-the-fly changes of trivial values that would not require any kind
>> or flushing or reinitialization by the encoder.
>>
>> Signed-off-by: James Almer <jamrial at gmail.com>
>> ---
> 
> I don't really see the big improvement over closing+reopening the encoder.

libx264 and libaom for example provides x264_encoder_reconfig() and 
aom_codec_enc_config_set() respectively, which lets you change some 
parameters on the fly, which although limited in scope (Neither will 
accept dimension changes, even if within the "max" set during init) is 
much more efficient compression-wise than closing+reopening the encoder.

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