Re: mjpegtools 2.0.0 RC1

Hallo

Linards Ticmanis wrote:
> Hello Bernhard, it's great to hear that you're going for a new major
> release.
Thanks.

> As for remaining problems: mpeg2enc after the last big bunch of
> patches still has trouble with low-bitrate encodings such as VCD,
> producing buffer underflows fairly regularly. At least it does in the
> state the CVS tree was in shortly before Christmas.
How did you notice ?

I did a quick check with the current CVS with that commands:
lav2yuv file.avi | yuvscaler -O VCD | \
mpeg2enc -f 1 -4 1 -2 1 -N 1.5 -M 2 -o video_VCD.m1v

mplex -f 1 audio.mp2 video_VCD.m1v -o VCD.mpg
...
   INFO: [mplex] Video stream 0: profile 1 selected - ignoring 
non-standard options!
    INFO: [mplex] Found 1 audio streams, 1 video streams and 0 subtitle 
streams
    INFO: [mplex] Selecting VCD output profile
    INFO: [mplex] Multiplexing video program stream!
    INFO: [mplex] Scanning for header info: Audio stream c0 (audio.mp2)
    INFO: [mplex] MPEG AUDIO STREAM: c0
    INFO: [mplex] Audio version  : 1.0
    INFO: [mplex] Layer          :        2
    INFO: [mplex] CRC checksums  :       no
    INFO: [mplex] Bit rate       :    28672 bytes/sec (224 kbit/sec)
    INFO: [mplex] Frequency      :     44100 Hz
.....
    INFO: [mplex] VIDEO STREAM: e0
    INFO: [mplex] Frame width     : 352
    INFO: [mplex] Frame height    : 288
    INFO: [mplex] Aspect ratio    : 1:0.9375 (4:3 PAL/SECAM for 
720x578/352x288 images)
    INFO: [mplex] Picture rate    : 25.000 frames/sec
    INFO: [mplex] Bit rate        : 1152000 bits/sec
    INFO: [mplex] Vbv buffer size : 40960 bytes
    INFO: [mplex] CSPF            : 1
    INFO: [mplex] SYSTEMS/PROGRAM stream:
    INFO: [mplex] rough-guess multiplexed stream data rate    : 1410896
    INFO: [mplex] target data-rate specified               : 1411200
    INFO: [mplex] Setting specified specified data rate: 1411200
...
    INFO: [mplex] VIDEO_STATISTICS: e0
    INFO: [mplex] Video Stream length:    27448417 bytes
    INFO: [mplex] Sequence headers:      334
    INFO: [mplex] Sequence ends   :        1
    INFO: [mplex] No. Pictures    :     4972
    INFO: [mplex] No. Groups      :      334
    INFO: [mplex] No. I Frames    :      334 avg. size 14489 bytes
    INFO: [mplex] No. P Frames    :     1325 avg. size  6967 bytes
    INFO: [mplex] No. B Frames    :     3313 avg. size  4037 bytes
    INFO: [mplex] Average bit-rate :  1104000 bits/sec
    INFO: [mplex] Peak bit-rate    :  1252000  bits/sec
    INFO: [mplex] BUFFERING min 13 Buf max 31655
    INFO: [mplex] MUX STATUS: no under-runs detected.
---ENDE----

That seems ok to me, but I have to admit that I didn't burn and test a 
VCD or SVCD for a very long time (2-3 years I guess).


> Unfortunately (or fortunately) I'm currently on vacation with only a
> small netbook at my disposal, so I don't know if anything has
> happened in that area since then, and I can't conduct any tests at
> this moment. I'll be home again next week.
I don't think that there were any CVS check-in the last 2 weeks.

BTW: Do you know why the patch for the reduction parameter -4 -2 did not 
make it into the CVS (You sent it to the developer mailinglist at the 
05.09.2010) ?
The patch lookes ok for me.  If no one objects I will add it to the CVS.

BTW2: Vacation is always good !

auf hoffentlich bald,

Berni the Chaos of Woodquarter

Email: [email protected]
www: http://www.lysator.liu.se/~gz/bernhard

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