Hello,
After I switch to remotes/origin/release/3.0 branch, I don't have the
problem any more, however when I try to run the example code
transcoding.c, I get the following error:
seaguest@DEV:~/ffmpeg_sources/FFmpeg/doc/examples$ ./transcoding cut.mp4
cut2.mp4
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'cut.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf57.25.100
Duration: 00:00:20.02, start: 0.023220, bitrate: 2960 kb/s
Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p,
1280x688, 2860 kb/s, 23.98 fps, 23.98 tbr, 24k tbn, 47.95 tbc (default)
Metadata:
handler_name : VideoHandler
Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz,
stereo, fltp, 94 kb/s (default)
Metadata:
handler_name : SoundHandler
[libx264 @ 0x25e0920] broken ffmpeg default settings detected
[libx264 @ 0x25e0920] use an encoding preset (e.g. -vpre medium)
[libx264 @ 0x25e0920] preset usage: -vpre <speed> -vpre <profile>
[libx264 @ 0x25e0920] speed presets are listed in x264 --help
[libx264 @ 0x25e0920] profile is optional; x264 defaults to high
Cannot open video encoder for stream #0
Error occurred: Generic error in an external library
Here is the video format information:
seaguest@DEV:~/ffmpeg_sources/FFmpeg/doc/examples$ ffprobe cut.mp4
ffprobe version n3.0.2-2-g08c21bc Copyright (c) 2007-2016 the FFmpeg
developers
built with gcc 5.3.1 (Ubuntu 5.3.1-14ubuntu2) 20160413
configuration: --prefix=/home/seaguest/ffmpeg_build
--pkg-config-flags=--static
--extra-cflags=-I/home/seaguest/ffmpeg_build/include
--extra-ldflags=-L/home/seaguest/ffmpeg_build/lib --enable-gpl
--enable-libx264 --enable-libx265 --enable-nonfree
libavutil 55. 17.103 / 55. 17.103
libavcodec 57. 24.102 / 57. 24.102
libavformat 57. 25.100 / 57. 25.100
libavdevice 57. 0.101 / 57. 0.101
libavfilter 6. 31.100 / 6. 31.100
libswscale 4. 0.100 / 4. 0.100
libswresample 2. 0.101 / 2. 0.101
libpostproc 54. 0.100 / 54. 0.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'cut.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf57.25.100
Duration: 00:00:20.02, start: 0.023220, bitrate: 2960 kb/s
Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p,
1280x688, 2860 kb/s, 23.98 fps, 23.98 tbr, 24k tbn, 47.95 tbc (default)
Metadata:
handler_name : VideoHandler
Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz,
stereo, fltp, 94 kb/s (default)
Metadata:
handler_name : SoundHandler
Could anyone help? why this example code doesn't work for H.264?
best regards
Yongkan
On 05/10/2016 09:52 AM, seaguest wrote:
Hello everyone,
I am trying the example for FFmpeg 3, but I get the following error:
seaguest@DEV:~/ffmpeg_sources/FFmpeg/doc/examples$ make all
cc -I/usr/local/include -Wall -g -c -o muxing.o muxing.c
muxing.c: In function ‘open_audio’:
muxing.c:250:11: warning: implicit declaration of function
‘avcodec_parameters_from_context’ [-Wimplicit-function-declaration]
ret = avcodec_parameters_from_context(ost->st->codecpar, c);
^
muxing.c:250:50: error: ‘AVStream {aka struct AVStream}’ has no member
named ‘codecpar’
ret = avcodec_parameters_from_context(ost->st->codecpar, c);
^
muxing.c: In function ‘open_video’:
muxing.c:432:50: error: ‘AVStream {aka struct AVStream}’ has no member
named ‘codecpar’
ret = avcodec_parameters_from_context(ost->st->codecpar, c);
^
<builtin>: recipe for target 'muxing.o' failed
make: *** [muxing.o] Error 1
It said the AVStream doesn't have the codecpar member, but I checked
the avformat.h, I do see the codecpar in AVStream, could anyone help?
best regards
Yongkan
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