[FFmpeg-user] [FFmpeg-devel] What is the problem with my transcoding?

G Alexander glen_alexndr at hotmail.com
Sat Mar 5 08:10:03 CET 2016


first thing that pops out is

you have 

> :scenecut=0 


and it should be two dashes before scenenot a colon, a colon means there is an operator before not an option

--scenecut <integer> 



> On Mar 3, 2016, at 19:31, fangzhen <wintelx264 at 163.com> wrote:
> 
> Hi guys,
> 
> Recently, I am doing some transcoding using ffmpeg. The input protocol is udp and output is HLS.
> The command line is the following:
> ffmpeg -hide_banner -threads auto -y -xerror -itsoffset 0.5 -async 1 -i udp://127.0.0.1:48882?overrun_nonfatal=1&buffer_size=100000000&fifo_size=100000000 -map p:3801 -vf movie='/home/u    buntu/codec/logo/zb_67.tga',scale=279.0:69.0[logo];[in][logo]overlay=main_w-overlay_w-96.0:54.0[out] -c:v libx264 -preset superfast -level:v 5.1 -s 1280x720 -r 25 -x264-params keyint=50    :scenecut=0 -b:v 1072k -c:a libfdk_aac -profile:a aac_low -b:a 128k -ac 2 -ar 44100 -hls_wrap 0 -hls_time 10 -hls_list_size 15 -hls_flags round_durations -hls_segment_filename /home/ubu    ntu/codec/release/hlstemp/20160304104101-01-%d.ts -start_number 1457059261 /home/ubuntu/codec/release/hlstemp/01.m3u8ยท
> 
> However, when the transcoder runs some time later, the ouput frames are abnormal, a lot of mosaic appears and sometimes the picture stalls for about 5 seconds.
> There are some logs of transcoder:
> [Parsed_overlay_2 @ 0x1e16100] [framesync @ 0x1e161e8] Buffer queue overflow, dropping.
> [Parsed_overlay_2 @ 0x1ea9720] [framesync @ 0x1ea9868] Buffer queue overflow, dropping.
> [Parsed_overlay_2 @ 0x1e16100] [framesync @ 0x1e161e8] Buffer queue overflow, dropping.
> [Parsed_overlay_2 @ 0x1ea9720] [framesync @ 0x1ea9868] Buffer queue overflow, dropping.
> [Parsed_overlay_2 @ 0x1e16100] [framesync @ 0x1e161e8] Buffer queue overflow, dropping.
> [Parsed_overlay_2 @ 0x1ea9720] [framesync @ 0x1ea9868] Buffer queue overflow, dropping.
> .........
> [h264 @ 0x9b1f7e40] left block unavailable for requested intra4x4 mode -1 at 0 6
> [h264 @ 0x9b1f7e40] error while decoding MB 0 6, bytestream 47923
> [h264 @ 0x9b1f7e40] concealing 7489 DC, 7489 AC, 7489 MV errors in I frame
> [h264 @ 0x9adf6260] Reference 3 >= 2
> [h264 @ 0x9adf6260] error while decoding MB 10 8, bytestream 65855
> [h264 @ 0x9adf6260] concealing 7239 DC, 7239 AC, 7239 MV errors in P frame
> [mpegts @ 0x3ad0880] PES packet size mismatch
> [ac3 @ 0x3face00] exponent out-of-range
> [ac3 @ 0x3face00] error decoding the audio block
> [ac3 @ 0x3face00] frame sync error
> 
> Can anyone help me to find out why?
> 
> Thinks in advance
> Felix Hu
> 
> 
> 
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