On Wed, Jun 19, 2013 at 2:37 PM, Dan Dennedy <d...@dennedy.org> wrote:
> On Wed, Jun 19, 2013 at 11:06 AM, Greg Stein <gst...@gmail.com> wrote:
>...
>> I was following the command line on the section that I linked to:
>>
>> $ melt -profile square_pal somevideo.foo ... -consumer
>> avformat:udp://224.224.224.224:1234?pkt_size=1316\&reuse=1 real_time=1
>> terminate_on_pause=0 f=mpegts vcodec=mpeg4 b=1000k s=320x240
>> acodec=mp2 ab=128k
>>
>> The text goes on to suggest trying h264 rather than mpeg4. And while
>
> I guess the text was being descriptive rather than literal or I made a
> typo. If you do a little research about encoding H.264 with
> ffmpeg/libav, then you'd know that you need to use "libx264" to do
> H.264 encoding.

Gotcha. When I saw "h264" in mlt's video codecs, I went for it. ...
and failed :-)

I see what you mean about descriptive/prose rather than being an
actual value for the cmdline. But as a newbie getting a feel for mlt,
it was a bump in the road. Maybe the page could be tweaked?

>> it seems ffmpeg (well, libav really) has h264, it isn't being seen by
>> mlt.
>
> libavcodec has "h264" for decoding. When you run "melt -query
> video_codecs" it is listing encoders only. The output of avconv
> -codecs varies by version, and it used to have a separate decode-only
> entry for h264 and encode-only entry for libx264. Now, it is lumping
> them together. Perhaps you can now use "h264" as an alias for libx264;
> I am not sure, but "libx264" is what MLT needs.

Thanks for the detailed explanation. "avconv -codecs" has a
column-based output with D and/or E specifying whether
decoding/encoding are available. In my case (v0.8.6 of libav), it
doesn't have h264 encoding available (installed on Ubuntu via
libav-tools). I can get that fixed.

I appreciate the quick help, all.

Cheers,
-g

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