[Libav-user] Trouble creating .mp4 file with MPEG4 video encoder

[Shellef]

Hi. I am trying to re-encode a video and have encountered a problem.

The new file is set to .mp4 format with the MPEG4 encoder. The encoding
process works without trouble,
but the resulting file is unreadable by my own application as well as some
others (though VLC plays it fine).

Strangely, when I set the format to .avi there are no issues.

These are the errors reported by ffmpeg debug log for my application when
it tries to read the .mp4 file:


[2018-10-27 11:24:06.392] [ffmpeglog] [info] [mov,mp4,m4a,3gp,3g2,mj2 @
000001d20ea67180] max_analyze_duration 5000000 reached at 5022508
microseconds st:0

[2018-10-27 11:24:06.392] [ffmpeglog] [info] [mov,mp4,m4a,3gp,3g2,mj2 @
000001d20ea67180] decoding for stream 0 failed

[2018-10-27 11:24:06.392] [ffmpeglog] [info] [mov,mp4,m4a,3gp,3g2,mj2 @
000001d20ea67180] stream 0: start_time: 0.032 duration: 10.677

[2018-10-27 11:24:06.392] [ffmpeglog] [info] [mov,mp4,m4a,3gp,3g2,mj2 @
000001d20ea67180] format: start_time: 0.032 duration: 10.677 bitrate=2499
kb/s

[2018-10-27 11:24:06.392] [ffmpeglog] [info] [mov,mp4,m4a,3gp,3g2,mj2 @
000001d20ea67180] Could not find codec parameters for stream 0 (Video:
mpeg4, 1 reference frame (mp4v / 0x7634706D), yuv420p(left), 2496 kb/s):
unspecified size
Consider increasing the value for the 'analyzeduration' and 'probesize'
options

[2018-10-27 11:24:06.392] [ffmpeglog] [info] [mov,mp4,m4a,3gp,3g2,mj2 @
000001d20ea67180] After avformat_find_stream_info() pos: 2063025 bytes
read:2119035 seeks:2 frames:151

[2018-10-27 11:24:06.397] [ffmpeglog] [info] [mpeg4 @ 000001d20ea64d00]
time_increment_bits 4 is invalid in relation to the current bitstream, this
is likely caused by a missing VOL header

[2018-10-27 11:24:06.397] [ffmpeglog] [info] [mpeg4 @ 000001d20ea64d00]
time_increment_bits set to 15 bits, based on bitstream analysis

[2018-10-27 11:24:06.397] [ffmpeglog] [info] [mpeg4 @ 000001d20ea64d00]
looks like this file was encoded with (divx4/(old)xvid/opendivx) -> forcing
low_delay flag

[2018-10-27 11:24:06.397] [ffmpeglog] [info] [mpeg4 @ 000001d20ea64d00]
Format yuv420p chosen by get_format().

[2018-10-27 11:24:06.397] [ffmpeglog] [info] [mpeg4 @ 000001d20ea64d00]
[IMGUTILS @ 00000046f8cfcc20] Picture size 0x0 is invalid

[2018-10-27 11:24:06.397] [ffmpeglog] [info] [mpeg4 @ 000001d20ea64d00]
video_get_buffer: image parameters invalid

[2018-10-27 11:24:06.397] [ffmpeglog] [info] [mpeg4 @ 000001d20ea64d00]
get_buffer() failed

[2018-10-27 11:24:06.397] [ffmpeglog] [info] [mpeg4 @ 000001d20ea64d00]
thread_get_buffer() failed

[2018-10-27 11:24:06.397] [ffmpeglog] [info] [mpeg4 @ 000001d20ea64d00]
get_buffer() failed (-22 0000000000000000)

[2018-10-27 11:24:06.397] [ffmpeglog] [info] [mpeg4 @ 000001d20ea64d00]
[IMGUTILS @ 00000046f8cfcc20] Picture size 0x0 is invalid

[2018-10-27 11:24:06.397] [ffmpeglog] [info] [mpeg4 @ 000001d20ea64d00]
video_get_buffer: image parameters invalid

[2018-10-27 11:24:06.397] [ffmpeglog] [info] [mpeg4 @ 000001d20ea64d00]
get_buffer() failed

[2018-10-27 11:24:06.397] [ffmpeglog] [info] [mpeg4 @ 000001d20ea64d00]
thread_get_buffer() failed

[2018-10-27 11:24:06.397] [ffmpeglog] [info] [mpeg4 @ 000001d20ea64d00]
get_buffer() failed (-22 0000000000000000)

[2018-10-27 11:24:06.397] [ffmpeglog] [info] [mpeg4 @ 000001d20ea64d00]
low_delay flag set incorrectly, clearing it

[2018-10-27 11:24:06.397] [ffmpeglog] [info] [mpeg4 @ 000001d20ea64d00]
[IMGUTILS @ 00000046f8cfcc20] Picture size 0x0 is invalid

[2018-10-27 11:24:06.397] [ffmpeglog] [info] [mpeg4 @ 000001d20ea64d00]
video_get_buffer: image parameters invalid

[2018-10-27 11:24:06.397] [ffmpeglog] [info] [mpeg4 @ 000001d20ea64d00]
get_buffer() failed

[2018-10-27 11:24:06.397] [ffmpeglog] [info] [mpeg4 @ 000001d20ea64d00]
thread_get_buffer() failed

[2018-10-27 11:24:06.397] [ffmpeglog] [info] [mpeg4 @ 000001d20ea64d00]
get_buffer() failed (-22 0000000000000000)

[2018-10-27 11:24:06.397] [ffmpeglog] [info] [mpeg4 @ 000001d20ea64d00]
[IMGUTILS @ 00000046f8cfcc20] Picture size 0x0 is invalid
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