November 2013 - ffmpeg-user - lists.ffmpeg.org

how to use drawtext?
by Richard Duran 02 Nov '13

02 Nov '13

Hello, I've finally figured out how to create a movie that combines an audio track with two videos side-by-side (with a spacer between the videos). Now I'd like to add text above and below the videos. The text will remain constant for the entire length of the movie. I've started looking at drawtext, but would like to see some examples. My current command is as follows: ffmpeg -i video1.avi -i video2.avi -i audio.wav -filter_complex "[0:v]setpts=PTS-STARTPTS, pad=iw*2.1:ih[bg]; [1:v]setpts=PTS-STARTPTS[fg]; [bg][fg]overlay=w*1.1" -apad -shortest movie.avi How would I use drawtext to: - create a label centered above the combined videos - create a label centered below each of the two videos TIA

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PCR, muxrate and DVBT
by Massimo Battistel 01 Nov '13

01 Nov '13

hello, I have to send through udp an mpeg-ts (v:mpeg2, a:mp2) to an hardware decoder. Before writing the script, I've read something about the argument finding a bit of confusion. I have these questions (for now): 1. How to set PCR from command line? 2. DVBT needs PCR < 40? 3. Is there any relation between PCR and "-muxrate" parameter? thanks, MB

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How to configure x86_64
by Elliott Balsley 01 Nov '13

01 Nov '13

From the latest git head, I try to configure ffmpeg with —arch=x86_64, but it ends up with x86 (generic). I’m running OS 10.9 on a Mac Pro 5,1. It’s a 64 bit machine and a 64 bit kernel, so why is this happening? Am I correct to assume that using 64 bit ffmpeg would mean faster encoding? Full output is here: http://pastebin.com/ce8sADAL

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Usual buld script fails
by Tim Nicholson 01 Nov '13

01 Nov '13

Just trying a static rebuild of current HEAD after rebuilding libx264 with my usual scripts and it fails, with config log listing issues of the form:- /home/tim/ffmpeg-tux/usr/local/lib64/libx264.a(opencl.o): In function `x264_opencl_load_library': opencl.c:(.text+0x46f): undefined reference to `dlopen' and several other similar undef's. Earlier I noticed:- /home/tim/ffmpeg-tux/usr/local/include/x264.h:36:4: warning: #warning You must include stdint.h or inttypes.h before x264.h [-Wcpp] Am I doing something daft, or has some change broken something? -- Tim

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Could I log a duration of ts files while encoding using hls?
by Boram Han 01 Nov '13

01 Nov '13

Hello. Could I log a duration of ts files that created while encoding for hls? In some case, I need to reuse pre-encoded ts files for creating new m3u8 playlist. Thank you for your feedback. Best Regards.

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using Directshow filter to modify mpeg-4 video
by Alexey Kool 01 Nov '13

01 Nov '13

Hello all! I have writen my own DirectShow filter. I am using it with popular video players and have no problems. So I need to apply my filter to some mpeg-4 video file. As i think i need to use ffmpeg to recode video file applying my filter. So the question is can I solve my problem using ffmpeg (for windows)? For example the procedure is: input_file(mpeg4) -> ffmpeg (using my filter) -> output_file(mpeg4) Regards! Alexey K.

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H264 encode support on Android
by jonsmirl＠gmail.com 01 Nov '13

01 Nov '13

In libavcodec/libstagefright.cpp I see support for H264 decode. Has anyone written the equivalent function for h264 encode? -- Jon Smirl jonsmirl(a)gmail.com

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