Thanks for the tip. Hadn't thought about that. That could possible be the
reason since when my server switches between recording profiles I set the
video rate first and then the max rate, i.e.
<snip>
int ret = video_set_controlbyid(fd,V4L2_CID_MPEG_VIDEO_BITRATE,
bitrate);
if( ret != 0 ) {
logmsg(LOG_ERR,"Can not set video bitrate ( %d : %s )",errno,
strerror(errno));
return -1;
}
ret = video_set_controlbyid(fd,V4L2_CID_MPEG_VIDEO_BITRATE_PEAK,
peak_bitrate);
if( ret != 0 ) {
logmsg(LOG_ERR,"Can not set video bitrate ( %d : %s )",errno,
strerror(errno));
return -1;
}
</snip>
I'll update the code to always check the old value and do as you suggest
so that logically it is always true that
video rate < max video rate
I'll report back on this thread once I verified this.
/Johan
On Wed, 09 Dec 2009 02:52:54 -0500, faginbagin <[email protected]> wrote:
> Johan Persson wrote:
>> I was wondering if someone could give some more detailed explanation of
>> why a
>> Hauppauge 150 (or 350/500) driver/chip combo refuses some ordinary
>> video
>> encoding bitrates while other work just fine.
>>
>> For example setting
>>
>> "Video Bitrate" 4 500 000
>>
>> gives an error while
>>
>> "Video Bitrate" 4 600 000
>>
>> works fine. Is there (for example) some "multiple" of a base value that
>> whould
>> be used ?
>>
>> (I would like to try to include some checking in my program to avoid
>> this error
>> message in case the end user have selected an "illegal" bit rate)
>>
>> Johan
>
> Could it be that when you first tried setting the video bitrate to
> 4,500,000, the maximum bitrate was less than that? I've found that the
> order in which you set these two parameters is important. If you want to
> adjust both values up, you must first set the maximum, then set the
video
> bitrate. If you want to lower both, you must first set the video
bitrate,
> then the maximum bitrate. So, before changing both values, you should
query
> the current maximum so you know which value to change first.
>
> HTH,
> Helen
>
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