[Libav-user] Fwd: Encoding with no compression with OpenH264

[Stephane Poirier]

Hi Arthur,

I don't know if it can help, but I am encoding raw video (no compression 
whatsoever) using codec
AV_CODEC_ID_RAWVIDEO with pixformat AV_PIX_FMT_RGB24 in container .avi file.

The .avi generated are huge but high quality.

I too, am looking for some lossless compression but I haven't found any 
way yet. I am a newbie to libav.

Steph


-------- Forwarded Message --------
Subject: 	[Libav-user] Encoding with no compression with OpenH264
Date: 	Mon, 7 Mar 2016 14:46:03 -0800
From: 	Arthur Muller <muller at vki.com>
Reply-To: 	This list is about using libavcodec, libavformat, libavutil, 
libavdevice and libavfilter. <libav-user at ffmpeg.org>
To: 	libav-user at ffmpeg.org



Hello,

I need to create a MP4/OpenH264 file from a series of images. Because 
the images are all of a technical nature, I need to have absolutely no 
compression. How can I achieve this with OpenH264?

When I used libx264 I set the number of b-frames to zero and it worked 
fine. I’m not sure OpenH264 even supports B frames given the discussion 
I saw here:

https://github.com/cisco/openh264/issues/1844

If anybody could let me know what parameters I need to set to prevent 
any compression and not skip any frames I would appreciate it.

Thanks.

-Arthur



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