set FFMPEG so it encode all but without the first 10 frames

[poisondeathray]

look at their chart

http://www.etymonix.com/products/softreel/softreel_mpeg2_decoder.htm

Frame-accurate seeking in AVI files Yes Yes

If it's true, you might be able to re-wrap into AVI without re-encoding . There are AVI "hack" tricks that get around the b-frame issue. E.g. DivX and Xvid use these hacks . Maybe this decoder does too ?

[marcorocchini]

Etymonix VFW seems to me a SD only codec, while softreel seems to me a directshow-only codec so I cannot use it.

Matrox VFW Mpeg2 I frame HD work well: scrub is ok, no frames problem but it (and the softlab codec) requires a re-encoding.

I was happy because with "ffmpeg -vcodec" or "-vcodec -g 0" I was hoping of native editing with no re-encode and loss of quality.

I find little strange that only ffdshow can reade and decode ffmpeg-output files via VFW (doing that moreover bad) but evidently it's so.

At this point, rather then transcode in Mpeg2 I frames, it might be convenient for me to encode in mjpeg (ffmpeg -vcodec mjpeg -q:v 0"), whereas at least the reading of files mjpeg is done internally by Speed Razor/Blade and this is the safer way.
However, I ask kindly 2 thing:

1) there is possibility that encoding with the command string:

ffmpeg -i c0020.mxf -vcodec mpeg2video -pix_fmt yuv422p -g 0 -q:v 0 -an -flags +ilme+ildct -alternate_scan 1 -top 1 cocco2.avi

to exclude the initial wrong-frames during encoding?

2) the problem is in encoding or in decoding? If wont to email the problem to the ffdshow team what should I say to him exactly
for understand the problem?

thank u

[poisondeathray]

softreel v2 is HD . See the chart
http://www.etymonix.com/products/softreel/softreel_mpeg2_decoder.htm

Maximum resolution 1920x1152

You cannot exclude "Wrong frames" because you don't know where they might be or when they might occur . But if you know where they are , you can use -t and -ss to encode segments (since you're re-encoding anyways, not -vcodec copy)

As described above, problem is decoding the MPEG2 with VFW in ffdshow for sure, because other formats do not have the problem (so that is proof that original source decoded fine, and encoded fine to say, FFV1, or UT Video Codec with ffmpeg , and decoded fine again with VFW, even ffdshow) .

You can submit a bug report to ffdshow, but I don't think it's actively developed any more (used to be daily or weekly updates, but nothing for months now) . Also, I doubt anybody has the time or inclination to fix MPEG2 in AVI - it's not a high priority format (really it's a dead format, nobody uses it).

[marcorocchini]

Can I configure ffdshow-encoder (old version) in a way to do what would do

ffmpeg -i c0020.mxf -vcodec mpeg2video -pix_fmt yuv422p -g 0 -q:v 0 -an -flags +ilme+ildct -alternate_scan 1 -top 1 cocco2.avi

and using the same ffmpeg libraries to decompress .mxf and re-encode in mpeg exactly as would do ffmpeg?

Just for a proof