Re: [FFmpeg-user] small mp4 videos for advertisement

2017-05-15 Thread William Caulfield
Many ways to go after this. Just to get you started: ffmpeg -i $INPUT -c:v libx264 -an -s 720x940 -crf 16 -maxrate 450k -bufsize 380k -pix_fmt yuv420p $OUTPUT the -an loses the audio, which I assume you don't need. On Sat, May 13, 2017 at 11:41 PM, negin tebyani

Re: [FFmpeg-user] gst-ffmpeg on ARM Linux: GNU assembler not found, install/update gas-preprocessor

2017-05-15 Thread Gottfried Haider
Some more investigation: In the config.log I see: gas-preprocessor.pl -arch arm -as-type -- as -v unknown as type: '--' (...) as: unrecognized option '-_ISOC99_SOURCE' The first error seems to be caused by $as_type being empty string in the ffmpeg configure script. Why this is I do not know.

Re: [FFmpeg-user] Query regarding mkvtimestamp_v2 filter

2017-05-15 Thread Gyan
On Mon, May 15, 2017 at 5:44 PM, tarun singhal wrote: > Hi All, > > I need help in understanding what does mkvtimestamp_v2 filter do. > I tried to search documentation around it but couldnt find. All I could > find was this command > *ffmpeg -i usopen.mp4 -f

[FFmpeg-user] Query regarding mkvtimestamp_v2 filter

2017-05-15 Thread tarun singhal
Hi All, I need help in understanding what does mkvtimestamp_v2 filter do. I tried to search documentation around it but couldnt find. All I could find was this command *ffmpeg -i usopen.mp4 -f mkvtimestamp_v2 -qscale:v 0 a.txt* which apparently seems to give out timestamp of each frame in the

Re: [FFmpeg-user] ffmpeg performance 3.3 vs. 3.2.4

2017-05-15 Thread Paul B Mahol
On 5/15/17, Chris wrote: > Hi, > > I'm batch transcoding h264 ts streams to h265. Lately, I replaced ffmpeg > 3.2.4 with 3.3, and noticed that the average frame rate for transcoding > dropped from about 2.4 to 1.0. For testing purposes, I have switched > back to 3.2.4 for the

[FFmpeg-user] ffmpeg performance 3.3 vs. 3.2.4

2017-05-15 Thread Chris
Hi, I'm batch transcoding h264 ts streams to h265. Lately, I replaced ffmpeg 3.2.4 with 3.3, and noticed that the average frame rate for transcoding dropped from about 2.4 to 1.0. For testing purposes, I have switched back to 3.2.4 for the next file, and the frame rate went up to 3.2.4 again.