[FFmpeg-devel] flv decoder question

[Reimar Döffinger]

On Sat, Jul 25, 2009 at 06:43:02PM -0700, Baptiste Coudurier wrote:
> On 07/25/2009 05:41 PM, Justin Ruggles wrote:
>> Can someone who knows about the FLV decoder explain these lines in
>> flv_read_header()?
>>
>>      if((flags&  (FLV_HEADER_FLAG_HASVIDEO|FLV_HEADER_FLAG_HASAUDIO))
>>               != (FLV_HEADER_FLAG_HASVIDEO|FLV_HEADER_FLAG_HASAUDIO))
>>          s->ctx_flags |= AVFMTCTX_NOHEADER;
>>
>> I ask because it is causing av_find_stream_info() to read way more data
>> than necessary for audio-only FLV files containing Speex.
>
> The idea is to read packets to create streams if flags is wrongly set,  
> but the check will cause NOHEADER to be always be set audio only or  
> video only files.

I think this is intentional, since IIRC there are files with audio and video
where the header still indicates only one of them.