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我目前正在尝试在Android上使用ffmpeg。我使用https://github.com/halfninja/android-ffmpeg-x264（我调整它不使用libx264并使用GCC 4.6编译ndk-r9b）构建ffmpeg。我尝试修剪MP4文件。但是，输入文件无法打开：Android上的ffmpeg解码器
11-28 10:59:18.494: INFO/com.rfc.video.VideoKit(4125): ffmpeg 11-28 10:59:18.494: INFO/com.rfc.video.VideoKit(4125): -i 11-28 10:59:18.494: INFO/com.rfc.video.VideoKit(4125): /storage/emulated/0/DCIM/20131126_173903.mp4 11-28 10:59:18.494: INFO/com.rfc.video.VideoKit(4125): -ss 11-28 10:59:18.494: INFO/com.rfc.video.VideoKit(4125): 2 11-28 10:59:18.494: INFO/com.rfc.video.VideoKit(4125): -t 11-28 10:59:18.494: INFO/com.rfc.video.VideoKit(4125): 4 11-28 10:59:18.494: INFO/com.rfc.video.VideoKit(4125): -vcodec 11-28 10:59:18.494: INFO/com.rfc.video.VideoKit(4125): copy 11-28 10:59:18.494: INFO/com.rfc.video.VideoKit(4125): -acodec 11-28 10:59:18.494: INFO/com.rfc.video.VideoKit(4125): copy 11-28 10:59:18.494: INFO/com.rfc.video.VideoKit(4125): /storage/emulated/0/DCIM/trimmed-000-20131126_173903.mp4 11-28 10:59:18.494: INFO/com.rfc.video.VideoKit(4125): Running main 11-28 10:59:18.494: INFO/Videokit(4125): Initializing AV codecs 11-28 10:59:18.494: INFO/Videokit(4125): ffmpeg version 0.9.2, Copyright (c) 2000-2012 the FFmpeg developers 11-28 10:59:18.494: INFO/Videokit(4125): built on Nov 27 2013 15:38:26 with gcc 4.6 20120106 (prerelease) 11-28 10:59:18.494: INFO/Videokit(4125): configuration: --enable-cross-compile --arch=arm5te --enable-armv5te --target-os=linux --disable-stripping --prefix=../output --disable-neon --enable-version3 --ar=arm-linux-androideabi-ar --disable-shared --enable-static --enable-gpl --enable-memalign-hack --cc=arm-linux-androideabi-gcc --ld=arm-linux-androideabi-ld --extra-cflags='-fPIC -DANDROID -D__thumb__ -mthumb -Wno-deprecated' --disable-everything --enable-decoder=mjpeg --enable-demuxer=mjpeg --enable-parser=mjpeg --enable-demuxer=image2 --enable-muxer=mp4 --enable-decoder=rawvideo --enable-protocol=file --enable-hwaccels --disable-ffmpeg --disable-ffplay --disable-ffprobe --disable-ffserver --disable-network --enable-filter=buffer --enable-filter=buffersink --disable-demuxer=v4l --disable-demuxer=v4l2 --disable-indev=v4l --disable-indev=v4l2 11-28 10:59:18.494: INFO/Videokit(4125): libavutil 51. 32. 0/51. 32. 0 11-28 10:59:18.494: INFO/Videokit(4125): libavcodec 53. 42. 4/53. 42. 4 11-28 10:59:18.494: INFO/Videokit(4125): libavformat 53. 24. 2/53. 24. 2 11-28 10:59:18.494: INFO/Videokit(4125): libavdevice 53. 4. 0/53. 4. 0 11-28 10:59:18.494: INFO/Videokit(4125): libavfilter 2. 53. 0/2. 53. 0 11-28 10:59:18.494: INFO/Videokit(4125): libswscale 2. 1. 0/2. 1. 0 11-28 10:59:18.494: INFO/Videokit(4125): libpostproc 51. 2. 0/51. 2. 0 11-28 10:59:18.504: ERROR/Videokit(4125): /storage/emulated/0/DCIM/20131126_173903.mp4: Invalid data found when processing input
我挖成的ffmpeg的代码，并且发现错误：
static int opt_input_file(OptionsContext *o, const char *opt, const char *filename)
{
// ...
ic->video_codec_id = video_codec_name ?
find_codec_or_die(video_codec_name , AVMEDIA_TYPE_VIDEO , 0)->id : CODEC_ID_NONE;
ic->audio_codec_id = audio_codec_name ?
find_codec_or_die(audio_codec_name , AVMEDIA_TYPE_AUDIO , 0)->id : CODEC_ID_NONE;
ic->subtitle_codec_id= subtitle_codec_name ?
find_codec_or_die(subtitle_codec_name, AVMEDIA_TYPE_SUBTITLE, 0)->id : CODEC_ID_NONE;
ic->flags |= AVFMT_FLAG_NONBLOCK;
ic->interrupt_callback = int_cb;
if (loop_input) {
LOGW(
"-loop_input is deprecated, use -loop 1\n"
"Note, both loop options only work with -f image2\n"
);
ic->loop_input = loop_input;
}
/* open the input file with generic avformat function */
err = avformat_open_input(&ic, filename, file_iformat, &format_opts);
if (err < 0) {
print_error(filename, err);
exit_program(1);
}
assert_avoptions(format_opts);
// ...
}
正如logcat中指出，err在这里等于AVERROR_INVALIDDATA。我不明白其中的原因：据我所知，mp4编解码器已启用。有关如何解决它的任何提示？
编辑：我添加了更多的ffmpeg代码。我很确定这是一个编解码器问题：ic-> video_codec_id设置为CODEC_ID_NONE，这会导致ic设置为NULL，并在avformat_open_input()中返回失败。