[FFmpeg-user] interlaced result when transcoding from h264

Henk D. Schoneveld belcampo at zonnet.nl
Fri Jan 10 00:56:40 CET 2014

On 09 Jan 2014, at 23:32, Mitja Pirih <mitja at alternet.si> wrote:

> On 09. 01. 2014 23:08, Henk D. Schoneveld wrote:
>> On 09 Jan 2014, at 22:38, Mitja Pirih <mitja at alternet.si> wrote:
>>> Hi,
>>> I am transcoding a h264 DVB-T stream but I am not satisfied with the
>>> results. The picture looks like "interlaced" on fast moving scenes.
>>> Here I posted (sorry for long post) some ffprobe data of the original
>>> (input) stream and output stream. What are my options to get a better
>>> picture?
>> AFAIK XBMC can deinterlace these streams.
>> Another question, why do you reencode ? I think XBMC is able to play the original stream, or am I wrong ?
> My goal is to downsize the stream as the streams will be pushed over a
> wireless network. The original stream is between 2.5-5mbps, my target is
> 1-1.8mbps. I am not so familiar with XBMC, I will check with the options.
> Thank you for pointing to crf flag, I will remove it from the config and
> leave just the nitrate.
Better remove the bitrate and leave the crf option. This way you get constant quality, if TV-show is ’talking heads’ it will be very low bitrate, and with sports, lot of movement you need higher bitrate for the same quality.  
> Another question, maybe connected to "interlacing". All transcoded
> streams have a dashed line on the top (first line). Do you have an idea
> why those lines appears after transcoding?
No I’ve no idea.
> Thank you,
> Mitja
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