On Wed, Jun 19, 2013 at 11:06 AM, Greg Stein <gst...@gmail.com> wrote: > On Wed, Jun 19, 2013 at 8:30 AM, Brian Matherly <pez4br...@yahoo.com> wrote: >>>I'm having a problem with vcodec skew. When I run: >>> >>>$ melt -query video_codecs >>> >>>There is no mention of h264. But when I run: >>> >>>$ avconv -codecs >>> >>>then I see h264 listed. >>> >>>Needless to say, since melt isn't seeing the codec (via the avformat >>>consumer), it is ignoring my vcodec= assignment. >>> >>>Is there something that I'm missing? I've been attempting to following >>>the cmdline suggested at: >>>http://www.mltframework.org/bin/view/MLT/Questions#How_can_I_stream_as_multicast_tr >>> >>>For starters, if I specify *any* vcodec=, then nothing goes through to >>>VLC. Just audio. When I drop it, then I get the original .mp4 passed >>>through and VLC shows the video. I've been trying to specify a codec >>>and bitrate, however, to increase the quality. And the h264 simply >>>isn't working. >> >> MLT uses libx264 for H.264 encoding. When you run "melt -query >> video_codecs", you should see an entry named "libx264". If you do not, then >> your mlt was not compiled with "--enable-libx264" > > There is no such switch for mlt itself. > > Looking at the build script that Carl referenced, it appears that > switch gets passed to ffmpeg rather than mlt.
correct >> It isn't perfectly clear what you are trying to do. You said "consumer" - >> which would be decoding, but I infer that you are trying to encode h.264 >> because you say you are sending it to VLC. > > 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. > 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. -- +-DRD-+ ------------------------------------------------------------------------------ This SF.net email is sponsored by Windows: Build for Windows Store. http://p.sf.net/sfu/windows-dev2dev _______________________________________________ Mlt-devel mailing list Mlt-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/mlt-devel
