Problem with artifacts when encoding to FLV using ffmpegX

[Leon_Cych]

I have had trouble with interlacing or artifacts when using ffmpeg to encode a HD MOV file to FLV.

I am converting a MOV h264, yuv420p, 1280x720 pcm_s16le, 44100 Hz, mono, 705 kb/s

to a FLV ffmpeg Flash Video, 1280x720, 200 kbps, 29.97 fps, no crop mp3, 22050 Hz, 56 kbps

as you can see by this example file

http://blip.tv/file/3544581

and looks like I am losing Data going by the log

h264 @ 0x54340c]concealing 3600 DC, 3600 AC, 3600 MV errors
[h264 @ 0x54340c]concealing 3600 DC, 3600 AC, 3600 MV errors
[h264 @ 0x54340c]concealing 3600 DC, 3600 AC, 3600 MV errors
[h264 @ 0x54340c]concealing 3600 DC, 3600 AC, 3600 MV errors
[h264 @ 0x54340c]AVC: Consumed only 93669 bytes instead of 93672
[h264 @ 0x54340c]AVC: nal size 0
[h264 @ 0x54340c]concealing 3600 DC, 3600 AC, 3600 MV errors
[h264 @ 0x54340c]AVC: Consumed only 106881 bytes instead of 106884
[h264 @ 0x54340c]AVC: nal size 0
[h264 @ 0x54340c]AVC: Consumed only 95037 bytes instead of 95040


it is greying out every few seconds - any ideas as to why and is there a solution?

Cheers in advance to anyone who might know

[Baldrick]

Moving you to our ffmpegx section.

[Case]

I am converting a MOV h264, yuv420p, 1280x720 pcm_s16le, 44100 Hz, mono, 705 kb/s
to a FLV ffmpeg Flash Video, 1280x720, 200 kbps, 29.97 fps, no crop mp3, 22050 Hz, 56 kbps
http://blip.tv/file/3544581

The full log might have helped more, as you excerpt only shows a fraction of what's going on.
- 200 kbps is certainly not enough for Flash Video, 1280x720, 29.97 fps. My first guess is that the grey comes from not enough bitrate.
- The blip.tv file is 222 kbps ABR video at only 320x240, 12 fps. Perhaps they converted your output file once more?
- If you want 1280x720 output, you should stick to AVC/H.264 for efficiency. Modern Flash players will play .mp4 just as fine as .flv, although I wouldn't want 1280x720 in a web page.